2020 Michindoh Truck and Tractor Pull Association Rules

Rules as of 12/15/2019

All changes highlighted in yellow.

General Rules:

1. Michindoh Classes are:

6,000lb. Stateline Pro Street 4x4 (points class)

6,200lb. 2wd Super Stock (points class)

6,200lb. 4wd Altered Stock (points class)

8,500lb. Pro Farm Tractors (points class)

9,500lb. Hot Farm Tractors (points class)

5,500lb. Michindoh Modified Rails (points class)

7,800lb. 2.5 Diesel Trucks (points class)

Open (see rules) 100% Payback

2. If at the end of a given pulling season, any point’s class that had an average
number of entries less than 3 over the course of that season. That class will be
transitioned to a 100% payback and will not be a point’s class for the following
season or may be dropped.

3. Class rules will not change throughout the current year unless there is a safety
issue with a rule. The decision of the board to change a rule deemed to be a
safety issue will require a majority vote of the board.

All drivers and vehicles in Michindoh classes must be paid Michindoh

members and possess a Michindoh pulling vehicle number.

5. Classes will have a random pulling order from event to event.

6. Drivers in all classes must be entered before the start of the pull. Late entries
for all classes: If not registered ½ hour before posted start time, you will be ﬁned
$20.00 for late entry fee.

7. If you cannot be at the pull on time, you may pre–enter by contacting someone
who can be there on time.

8. If you break before your class starts, your entry fees will be refunded.

9. NO refunds after class starts.

10. The driver who is on the entry form MUST be the driver in the vehicle. If a
substitute is required, you must notify Michindoh oﬃcials before the vehicle is
pulled up to the sled.

11. Drivers that make a full pull MUST be the drivers in the pull oﬀ. NO
substitution will be allowed or the pull will be disqualiﬁed.

12. For general safety, the Head Tech Oﬃcial and/or class tech oﬃcial may inspect
a vehicle at any time. This includes, but does not limit to: pumping for cubic inch,
checking the fuel system and any safety item, under the hood or in the drive
train. All owners/representatives of all vehicles at any pull site must allow an
inspection to be done in his presence. A random pump ball will be used during
registration to select who will be pumped. Anyone who refuses will be in direct
violation of this rule and will be subject to disqualiﬁcation under protest tear down
rules.

13. Only the oﬃcial operating the pump and the owner of the vehicle being
pumped will be allowed near the vehicle while being pumped.

14. As soon as the sled returns and/or the start line oﬃcials call you, drivers must
be ready to pull. The driver will have THREE MINUTES to hook to the sled and
tighten the chain. After this time, the pull will be forfeited.

15. Contestant will be allowed 2 attempts to start the sled within the ﬁrst 100 feet
of the pull, at the discretion of the starting ﬂagman. Only 2 attempts allowed to
start the sled in the event of a pull oﬀ. Vehicles’ are not allowed to return to the
pits if involved in a pull oﬀ.

16. The total weight of the pulling vehicle includes driver.

17. Driver’s meeting takes precedence over all written rules.

18. Idle speed only while driving in pit area.

19. All electric fuel pumps must be connected through the kill switch.

20. All pulling vehicles must have a 3–1/4” wide x 3–3/4” deep opening due to
NTPA rule changes on weight transfer hooks.

21. All pulling vehicles must have reverse lights (white lights) and neutral start
switches. Light should be mounted near hitch. This is mandatory for all classes.

22. There will be no “gimme” hooks for any driver or vehicle.

23. All vehicles must have a working ﬁre extinguisher.

24. Board of Director has precedence over all.

25. All drivers must wear approved helmets and seat belts.

26. All drivers must have valid state drivers license.

27. An owner cannot change vehicle and keep same vehicle number and or
transfer points.

28. With an incorporated safe shut down area, all tracks will be 300 ft long
whenever possible. Rather than starting a class all over, the head judge and sled
operator may utilize some of the shut down area to extend the ﬁnish line to a
ﬂoating ﬁnish if the sled is set properly, as long as the sled will stop the class
within 30 ft of the original ﬁnish line. A pulling track may be shortened from 300
ft, to maintain a 100 ft minimum shutdown.

29. Vehicles must have a one piece, 1/4” hydro form bell housing on any straight
shift. If any modiﬁcations are made, modiﬁed area must be ground smooth inside
and out. All vehicles using a clutch and ﬂywheel assembly will run a full block
saver plate of 1/8” steel, with all bolts possible installed. Diesel powered vehicles
are exempt from this rule.

30. All ﬂywheels must be steel or aluminum and SFI approved. No cast stock
ﬂywheels allowed. Each vehicle owner will sign a waiver on the membership form
stating that they are running a SFI approved ﬂywheel.

31. All automatic transmissions must have SEMA approved scatter blanket and SFI
approved ﬂexplate.

32. Block spacers to accommodate multiple disc clutches must be as substantial
as the block ﬂange to retain ﬂywheel. This will be at the tech oﬃcial discretion.

33. All vehicles must have easy and ample access to hitch to hook chain.

34. All Reese style hitch inserts must be a class 5 or solid insert. With no
movement in any direction.

35. Any engine to be pumped or torn down is allowed 1% max tolerance.

36. All vehicles must have working hydraulic brakes capable of sliding the tires
when applied.

Michindoh Points System

The point’s structure is as follows:

1st 15 place points + 15 hook points /11th 5 place points + 15 hook points

2nd 14 place points + 15 hook points /12th 4 place points + 15 hook points

3rd 13 place points + 15 hook points /13th 3 place points + 15 hook points

4th 12 place points + 15 hook points /14th 2 place points + 15 hook points

5th 11 place points + 15 hook points /15th 1 place points + 15 hook points

6th 10 place points + 15 hook points /16th and lower will receive zero place

7th 9 place points + 15 hook points / and 15 hook points

8th 8 place points + 15 hook points

9th 7 place points + 15 hook points

10th 6 place points + 15 hook points

Points Rules

To be eligible for 15 hook points, the compe tor must compete in a point’s class, and have paid an
entry fee, passed inspec on, and paid full Michindoh membership dues. Points are awarded to the
vehicle, not to the driver. Each pulling vehicle will receive placing point at each pulling event. First
place will be awarded 15 points, Second place will be awarded 14 points, and so on. If a pull is
cancelled, 30 “show up” points will be issued to those vehicles already entered. At the end of season,
all compe tors will drop their lowest “place points” from the season. The compe tor’s lowest place
points may include a missed event. At the end of the pulling season if there is a e in points between
vehicles in the same class, the distances that each of the vehicles pulled at each of the events will be
added together. Whoever has the furthest total distance will be awarded the points championship
On–track disqualiﬁca ons (i.e. out of bounds, loss of weight, etc) will receive last place points and last
place payout in class. If there is more than one entry disqualiﬁed in a given class, the last place points
and payout will be divided equally among the disqualiﬁed entries.

Protest and Tear Down Rules

You may protest (if you are Michindoh member in the same class) to have any vehicle
pumped the night of a pull by presenting $350.00 to the president or vice president present. If
found to be illegal by the pump, the owner may tear down the engine at their expense to
prove it legal or be barred from competition for one year from violation. If the vehicle in
question is found to be legal it will keep the $350.00 pump fee.

You may also protest to have a vehicle torn down (if you are a Michindoh member in the same
class). The person protesting must bring $750.00 cash to the president or vice president
present. The protest will be discussed. If the vehicle in question is to be torn down, it will have
the option to do it at the track or at the nearest suitable location. The vehicle or engine will be
impounded until the tear down. The tear down must happen with–in three days of the protest.
If the vehicle in question is found to be legal, all protest fees will go to the owner.

Any vehicle found illegal and/or refuses to be protested or teched, will be barred from
competition for one year from violation. Unless, they are willing to pay a reinstatement fee of
$500.00 to the club and prove the vehicle is legal. Any money and points won the day of the
protest will be returned or withheld by the club. If the vehicle in question refuses to refund
winnings, the amount of those winnings will be added to the reinstatement fee. The tech–
official for the class has the right to check any vehicle they feel may be in violation of any
rules without a protest fee with the permission of the board of directors.

Causes for Disqualification

1. Loss of anything oﬀ the vehicle (i.e.: weights, parts, etc.) while it is in motion,
except in the case of breakage in the drive–line, until red ﬂag is waved.

2. Loss of safety equipment or failure of safety equipment to function.

3. Excessive loss of liquid or steady stream, except in the case of internal
breakage.

4. Illegal fuel and use of Nitrous Oxide.

5. Any part of your vehicle out of bounds from start to ﬁnish while under the green
ﬂag.

6. Unsafe operations of any vehicle in pits or on track (i.e.: no hole shots,
excessive speed, etc.)

7. INTOXICATION of any driver or pit crew member or any smell of alcohol on a
driver’s breath.

8. Illegal equipment.

9. Leaving starting line under red ﬂag.

10. Un–sportsman like conduct.

11. No reverse in vehicle.

12. If DQ for cheating, all points and money will be forfeited.

13. If a DQ vehicle will receive last place points in the class, and if more than 1
vehicle is DQ, they share at the bottom of the list in the same order they were
otherwise. Out of bounds only.

Track Preparation:

A Michindoh safety tech or officer will be in charge of track preparation and maintenance. All
event personnel will be under their supervision. Failure of event personnel to comply will
mean cancellation of the event. This rule has been added to provide better pulling tracks.
Michindoh members will also be required to assist the officers with other track work as
needed at the pulls, such as lining up pulling vehicles, flagging, etc.

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED DUE

TO YOUR SAFETY AND THE SAFETY OF OTHERS. THE

OFFICIALS’ DECISIONS ARE FINAL!

**The Head of Class/Tech Oﬃcial for each class will enforce all
of the rules! Every vehicle will be teched on a random basis
at some point throughout the season.**

6200lb. 4wd Altered Stock

Rules locked 2019, 2020, 2021

With the exception of safety requirements approved by the board.

Must also follow all general rules listed above.

1. Hood modiﬁcations and upright headers are acceptable.

2. Tires must be D.O.T. approved for highway use and uncut. No recaps.

3. Protest rules in eﬀect.

4. The decisions of the pulling oﬃcials are ﬁnal.

5. Kill switches are mandatory. Electric fuel pumps must be wired through the kill
switch.

6. Trucks must have a full body, no ﬂat beds, if bed ﬂoor is removed it must be
covered and not visible to spectators.

7. Will allow racing seat.

8. Fuel tanks are allowed to be in front of vehicle if they are S.F.I. and have
braided hoses and pressure coupler. Batteries may be mounted out in front of the
truck but battery must be enclosed. No Batteries in cab.

9. All drivers are required to wear full face helmets and jackets and pants with a
SFI rating of 3–2a–1. Shoes also recommended.

10. All drivers are required to wear seatbelts.

11. All vehicles must have a working ﬁre extinguisher.

12. No tilt bodies are allowed.

13. Truck must be a working 4x4 truck.

Weights:

1. Front weights to be a maximum of 60” from center of front axle.

2. No loose weights in cab.

Hitches:

1. Maximum hitch height is 26 inches, & minimum 42 inches from center of rear
end maximum of 48 inches.

2. You must use a steel plate hook point with a minimum 3 ¼ wide 3 ¾ deep hole.

3. Pivot point of hitch cannot be forward of center of rear axle. It must be below
top of frame rails, and hook point must be behind frame rail or body.

4. Hitches must be tight and have no movement in any direction.

Engines:

1. Maximum 514 cubic inch limit.

2. Any single four–barrel carburetor is allowed.

3. No turbochargers or superchargers.

4. No fuel injection unless factory equipped.

5. Cast iron block and heads only, except FORD FE allowed to run aluminum
cylinder heads.

6. Aluminum intake may be used.

7. No pressurized fuels. No methanol alcohol fuel.

8. Front of engine block cannot extend more than 10 inches of the center of the
front axle. Front axle must be in stock location.

Harmonic Balancer:

1. All engines must be equipped with a harmonic balancer or dampener meeting
SFI Spec18.1.

2. All vehicals are required to shield all rotating mass mounted on the front of the
crankshaft, if unobstructed. Shields to be from frame rail to frame rail and top to
bottom. Shields to be a minimum of .125” steel or aluminum fastened by at least
2 evenly spaced 3/8” grade 5 bolts.

Transmissions & Drivelines:

1. Maximum wheel base 134 inches center to center.

2. Stock type one ton or two ton drive–lines are permitted. No planetary.

3. Drop box’s are allowed. Reverses are not allowed.

4. May block frame solid.

5. Must have scatter proof bell housing or automatic transmission blanket, and
S.F.I ﬂywheels.

6. No tube chassis are allowed.

U–joint shielding:

1. All u–joints and yokes must have a 360 degree cover, at least 6” long (covering
entire yoke and u–joint), 1/4” thick steel (3/8” thick aluminum). Inside diameter of
shield will be no more than 2" larger than u–joint. If cover is cut in half it must be
fastened no farther than 1” from ends with at least 3/8”– grade 8 bolts. Must be
bolted a maximum of 6” from bolt to bolt. All intermidiate shafts need covered
360 degrees. NO HINGE STYLE fasteners permited. Must be securly fastened.

Drive shaft loops:

1. Drive shaft loops required (3/4” or wide), 1/8” or thicker steel (1/4” or thicker
aluminum). No more than 2” larger than the largest u–joint. If cut in half, must be
bolted within 1” from ends and a maximum of 16” apart from loop to loop
(multiple loops). If using a one piece cover it must be bolted a maximum of 6”
apart the entire length and at least 1” from ends. All fasteners must be at least
3/8”– grade 8 bolts. NO HINGE STYLE permited. Must be securly fastened.

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED

DUE TO YOUR SAFETY AND THE SAFETY OF OTHERS.

THE OFFICIALS’ DECISIONS ARE FINAL!

**The Head of Class/Tech Oﬃcial for each class will enforce all

of the rules! Every vehicle will be teched on a random basis
at some point throughout the season.**

6200lb. 2wd Super Stock

Rules locked 2019, 2020, 2021

With the exception of Safety requirements approved by the Board.

Must also follow all general rules listed above.

Engines:

1. Maximum single 514 cubic inch 1% tolerance, naturally aspirated V8 engine.

2. Cylinder heads: two valves and one spark plug per cylinder. Aluminum heads
are allowed. No less than 24 degree head. No Hemi heads.

3. Legal aluminum heads: CHEVROLET: dart–320, 360, and Pro 1, Brodix 1 & 2,
and all Edelbrock. FORD: Cobra jet, Blue Thunder and TFS A460. CHRYSLER: Indy
444–1. Not limited to these heads, but must meet A & B.

3a. Must have cast aluminum manifold.

3b. Must except stock rocker arm assembly.

4. The front of the engine block cannot extend more than 160 inches forward of
the center of the rear axle or 20 inches forward of the center of the front axle.

5. Gasoline only, no pressurized fuels, no methanol.

Harmonic Balancer:

3. All engines must be equipped with a harmonic balancer or dampener meeting
SFI Spec18.1.

4. All vehicals are required to shield all rotating mass mounted on the front of the
crankshaft, if unobstructed. Shields to be from frame rail to frame rail and top to
bottom. Shields to be a minimum of .125” steel or aluminum fastened by at least
2 evenly spaced 3/8” grade 5 bolts.

Hitches:

1. Maximum height 30 inches.

2. Minimum 36 inches behind center of rear axle.

3. Maximum 48 inches behind center of rear axle.

4. Pivot point of the hitch can not be forward of the center of the rear axle.

5. Must be rigid at all hook points.

6. Must be no smaller than a 3 ¼ deep 3 ¾ wide opening at the hook point.

Tires & Wheels:

1.Can run any size street legal DOT tire. Maximum size 35x12.50 or 315–70–16
metric. Can run 34X18.0X15 pulling tires allowed.

2. No split rims; snap rings or dual wheels.

Transmissions & Drivelines:

1. Stock altered frames. No tube chassis.

2. Maximum wheel base 140 inches center to center.

3.All u–joints and yokes must have a 360 degree cover, at least 6” long (covering
entire yoke and u–joint), 1/4” thick steel (3/8” thick aluminum). Inside diameter of
shield will be no more than 2" larger than u–joint. If cover is cut in half it must be
fastened no farther than 1” from ends with at least 3/8”– grade 8 bolts. Must be
bolted a maximum of 6” from bolt to bolt. All intermidiate shafts need covered
360 degrees. NO HINGE STYLE fasteners permited. Must be securly fastened.

4. Drive shaft loops required (3/4” or wide), 1/8” or thicker steel (1/4” or thicker
aluminum). No more than 2” larger than the largest u–joint. If cut in half, must be
bolted within 1” from ends and a maximum of 16” apart from loop to loop
(multiple loops). If using a one piece cover it must be bolted a maximum of 6”
apart the entire length and at least 1” from ends. All fasteners must be at least
3/8”– grade 8 bolts. NO HINGE STYLE permited. Must be securly fastened.

5. Must have a fully enclosed S.F.I. approved explosion proof bell housing on
standard transmission.

6. Must have S.F.I. approved ﬂywheels for both automatic and standard
transmissions.

7. Automatic transmissions must have S.F.I. approved ﬂywheel shield and
transmission blanket, or tunnel shield.

8. Any rear axle is allowed.

Weights & Safety Rules:

1. Weights can be mounted anywhere on the truck in safe manner. No Loose
weights in cab.

2. Weights cannot extend more than 60 inches forward of the center of the front
axle, or any part of the truck.

3. Driver must wear seatbelt.

4. Batteries must be in protective case and must have a battery disconnect switch
on outside if mounted in front. No batteries in cab.

5. Must be mounted and working ﬁre extinguisher in the cab.

6. No gas tanks in the cab.

7. Must have working kill switches and they will be checked.

8. Brakes must hold vehicle.....steering brakes are allowed.

9. Must have radiator overﬂow.

10. Drivers must be at least 16 years of age and have a valid driver’s license.

11. No car bodies, vans, blazers, broncos, or ﬁberglass bodies allowed. With
ﬁberglass hoods being the only exception.

12. Hood required covering as much area as possible.

13. Engine side shields required (.100 for steel and .125 for aluminum), unless
inner fenders are installed.

14. No holes in ﬁrewall or ﬂoor larger than 1 inch.

15. Balancer must be S.F.I. approved or covered 360 degrees.

16. Nerf bars at least 8 inches behind clevis or body to prevent injury.

17. Fuel tanks are allowed to be in front of vehicle if they are S.F.I. approved and
have braided hoses and pressure coupler.

18. 2wd– must have wheelie bars. Maximum ground clearance of 6", and 18"
behind rear end.

19. All drivers are required to wear full face helmets, jackets, pants with a SFI
rating of 3–2a–1and 3.3/5 shoes recommended.

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED DUE

TO YOUR SAFETY AND THE SAFETY OF OTHERS. THE
OFFICIALS’ DECISIONS ARE FINAL!

6000 lb. Stateline Pro–Street 4wd

Rules locked 2019, 2020, 2021

With the exception of safety requirements approved by the board.

Must also follow all general rules listed above.

General Rules:

1. Drivers must wear approved full face helmet, approved ﬁre jackets and pants
with a SFI rating of 3–2a–1, and seatbelts, SFI shoes recommended.

2. Cowl induction hood allowed–No open holes.

3. Tires must be D.O.T. approved for highway use 33x12.50 inches, or 305–70–16
metric maximum tires size. No cut tires, No boggers. No recaps.

4. One ton driveline or less, u–joints, driveshaft, rear end, transmission and
transfer case. Trucks must have complete suspension in factory location with at
least 1” of travel but may be temporally blocked to pull. All rear–end bars must be
forward of rear axle.

5. No special bumpers, snowplow hook ups, or brush guards. Front bumper must
be in stock location and nothing protruding beyond the bumper.

6. The decisions of the pulling oﬃcials are ﬁnal.

7. Trucks must have reverse lights of some sort.

8. Must have scatter–proof bell housing or blanket, and a kill switch.

9. Any unsafe manner of vehicle (on or oﬀ track) will be disqualiﬁed.

10. Top 3 placing trucks may be teched after pull. Any truck in violation will forfeit
placing and hook fees, Tear down and protest rules apply.

11. Fuel cells can be added but must be secured inside the bed or under the bed.

12. Front axle must be in factory location, maximum wheelbase 134 inches. No
narrowing of the front or rear axle, 3 rear leaf springs minimum.

13. Truck must have a full body. No gutting of truck. Trucks must have full bed and
a solid ﬂoor made of metal or wood with rear inner fenders and all factory glass.
No ﬂatbeds.

14. Any truck that has been lightened in any way may be penalized by adding
weight to the rear of the vehicle at the discretion of the tech oﬃcial.

15. All vehicles must have a working ﬁre extinguisher.

16. Must have working hydraulic brakes.

17. No batteries in cab.

Weights:

1. Weight can be added, but must be secured and not visible in the front of the
vehicle. Weight must be secured and can be visible in the bed of the truck.

Hitches:

1. Hitch is to be no more than 20 inches oﬀ the ground, and hook point must be

42 inches minimum from center rear axle. All vehicles must have easy and ample
access to hitch to hook chain. Pivot point of hitch cannot be forward of center of
rear axle and must be below top of frame rail. No bars or chains from hitch to

axle. All bars or hitch components must fasten to the frame rail only. Hitch
opening must be 3 ¼ wide by 3 ¾ deep.

2. Hitches must be tight and have no movement in any direction.

Engines:

1. Maximum 472 cubic inch, naturally aspirated.

2. Single four barrel carburetor, maximum 4150 ﬂange allowed. No Dominator,
King Demon, or predator carburetors allowed.

3. No fuel injection.

4. Cast iron blocks must be used. No aluminum blocks factory aluminum heads
are allowed. All blocks and heads must have OEM part number. Any production
block. No Merlin, Dart, Bowtie, or SVO parts. No hemi heads.

5. Aluminum intakes are allowed.

6. Headers are allowed must exit down and back.

7. Electric water pumps are allowed.

8. Race fuel is allowed, No alcohol, LP, or Nitrous oxide.

9. All engines are required to have a S.F.I. approved balancer and ﬂywheel.

10. Front of engine block cannot extend more than 10 inches of the center of the

front axle. Front axle must be in stock location.

Harmonic Balancer:

1. All engines must be equipped with a harmonic balancer or dampener meeting
SFI Spec18.1.

U–joint shielding:

Drive shaft loops:

2. Drive shaft loops required (3/4” or wide), 1/8” or thicker steel (1/4” or thicker
aluminum). No more than 2” larger than the largest u–joint. If cut in half, must be
bolted within 1” from ends and a maximum of 16” apart from loop to loop
(multiple loops). If using a one piece cover it must be bolted a maximum of 6”
apart the entire length and at least 1” from ends. All fasteners must be at least
3/8”– grade 8 bolts. NO HINGE STYLE permited. Must be securly fastened.

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED DUE

TO YOUR SAFETY AND THE SAFETY OF OTHERS. THE

OFFICIALS’ DECISIONS ARE FINAL!

**The Head of Class/Tech Oﬃcial for each class will enforce all
of the rules! Every vehicle will be teched on a random basis
at some point throughout the season.**

9,500lb. Hot Farm Tractors

Rules locked 2019, 2020, 2021

With the exception of safety requirements approved by the board.

Must also follow all general rules listed above.

Engines:

1. Maximum 540 cubic inch limit, 1% tolerance.

2. Water injection is allowed. No oxygen carriers or combustion accelerators
allowed. Water only.

3. Factory after cooler allowed. AGRICULTURE/OEM USE ONLY.

4. Turbo limited to 3" inlet, 3 1/2" outlet.

a. Compressor wheel must protrude into the 3” bore at least 1/8 inch.

b. All turbine wheel blades must protrude into the 3.5 bore at least 1/8 inch

c. Intake and exhaust will be measured at the intersection of the wheel face and
tip diameter.

d. No variable geometry turbo.

5. No additional openings in compressor housing outside the 3” opening. MWE
groove is allowed to be open no more than .200.

6. Factory cast iron cylinder head and block, no aluminum or deck plates.

7. Diesel fuel only, no additives or pressurized fuels, NTPA fuel guidelines 409.

8. Stock appearing manifolds, intakes and exhaust.

9. Maximum of two valves per cylinder.

10. Engines must be from same manufacturer and must bolt in stock location
without modiﬁcation.

a. Any and all engine upgrades must not cross manufacturer’s lines and must be
approved by class members and Board of Directors. i. Class members and Board
of Directors have approved the use of a 12 valve 5.9L Cummins in an Oliver 16xx–
18xx series chassis.

11. Mechanical fuels systems only. No computerized or electronically controlled
fuel systems. No ice on board.

Hitches:

1. Hitch height is maximum of 20 inches.

2. Must be within 18 inches to 30 inches behind the center of the rear axle.

3. Must be ridged with no movement in all directions.

4. No more than 11/2 inch diﬀerence between hitch mounting point and hitching
point.

5. Hook hole is required to be a minimum of 3 ¼ wide 3 ¾ deep opening ID (allow
ample room for person hooking the chain).

Tires & Wheels:

1. Maximum tire size 20.8/38.

2. Cut tires are allowed.

3. Front tires must track rear tires.

Safety:

1. Emergency air shut–oﬀ is mandatory (must be easily accessible to person
hooking the chain).

2. If equipped with an electric fuel pump, tractor must have a electric kill switch
wired to the emergency air–shut–oﬀ.

3. Must have a mandatory manual three–way dump valve ahead of the injection
pump, to be operated by the driver.

4. Must have working ﬁre extinguisher that is within reach of the driver.

5. Must have working, individual rear brakes. Must have needle bearing cross in
diﬀerential.

6. Must have wheelie–bars.

7. Must have clutch blanket or steel shield installed 270 degrees 3/8 inch thick,
and 12 inches wide.

8. Seat belts required.

9. Roll over protection mandatory. 3 bar roll cage manufactured from 2” ODx.120
wall.

10. Must have a steel ﬂywheel and clutch assembly.

11. Side shields–Engine side shields are mandatory. Shields must be solid and
minimum of .060” thick steel, or .120” thick aluminum.

the head to the centerline of the crankshaft and extend the full length of the block
on each side of the engine.

12. All inline turbocharged engines are required to have one 3/8” or larger cable
that surrounds the engine block and head. This cable must be placed between the
ﬁrst and second cylinder. Cable must have 2 clamps at the splice and have no
more than 4” of slack.

13. Tie–bars securing front frame rails to rear axle housing are mandatory.

14. All drivers are required to wear full face helmets and jackets and pants with
SFI rating of 3–2a–1 and shoes with a SFI 3.3/5 rating.

15. Must have 2–3/8” bolts in a cross pattern installed in exhaust pipe.

16. Front skies are mandatory. All tractors must have skid plates mounted in line
with each frame rail and extended from the center of axle forward (on both sides)
equal in strength to frame rail material. Skid must be securely mounted and
braced to the cassis. Recommended skid surface to be a minimum of 4 inches
wide and 12 inches long with a minimum of 6 inches curve when measured from
the front of most part of rolled edge. Maximum ground clearance is bottom of
wheel rim not to exceed 4 inches with front tires in normal position.

Harmonic Balancer:

1. All engines must be equipped with a harmonic balancer or dampener meeting
SFI Spec18.1.

Appearance:

1. Tractor must be in stock appearance, hoods, grills, & fenders, (except injection
pump & after cooler).

2. All tractors that utilize tube ladder–type frames must be covered on outside
with steel or aluminum 0.060 thick.

3. Maximum wheel base is 114”.

4. Maximum length is 13’ from center of rear axle to forward–most part of tractor,
including weights, not including front hitch.

8,500lb. Pro Farm Tractors

Rules locked 2019, 2020, 2021

With the exception of safety requirements approved by the board.

Must also follow all general rules listed above.

Engines:

1. Maximum 510 cubic inch limit, 1% tolerance.

2. Water injection is allowed. No oxygen carriers or combustion accelerators
allowed. Water only.

3. Turbo are limited to 3" inlet x 3.5” outlet.

a. Compressor wheel must protrude into the 3” bore at least 1/8 inch.

b. All turbine wheel blades must protrude into the 3.5” bore at least 1/8 inch.

c. Intake and exhaust will be measured at the intersection of the wheel face and
tip diameter.

d. No variable geometry turbo.

4. No additional openings in compressor housing outside the 3" opening. MWE
groove is allowed to be open no more than .200.

5. Factory cast iron cylinder head and block no aluminum and no deck plates.

6. Diesel fuel only, no additives or pressurized fuels, NTPA fuel guidelines 409.

7. Stock appearing manifolds, intake and exhaust.

8. The largest fuel injector pump allowed will be a Bosch P series pump with only
one plunger per cylinder.

9. Maximum of two valves per cylinder.

10. Engines must be from same manufacturer and must bolt in stock location
without modiﬁcation.

b. Any and all engine upgrades must not cross manufacturer’s lines and must be
approved by class members and Board of Directors.

i. Class members and Board of Directors have approved the use of a 12 valve 5.9L
Cummins in an Oliver 16xx–18xx series chassis.

11. Mechanical fuels systems only. No computerized or electronically controlled
fuel systems. No ice on board.

Hitches:

1. Hitch height is maximum of 20 inches.

2. Must be within 18 inches to 30 inches behind the center of the rear axle.

3. Must be ridged with no movement in all directions.

4. No more than 1 1/2 inch diﬀerence between hitch mounting point and hitching
point.

5. Hook hole is required to be a minimum of 3 ¼ wide 3 ¾ deep opening ID.

Tires & Wheels:

1. Maximum tire size 18.4/38.

2. Front tires must track rear tires.

Safety:

1. Emergency air shut–oﬀ is mandatory (must be easily accessible to person
hooking the chain).

2. If equipped with an electric fuel pump, tractor must have an electric kill switch
wired to the emergency air–shut–oﬀ.

3. Must have a manual three–way dump valve ahead of the injection pump, to be
operated by the driver.

4. Must have working ﬁre extinguisher that is within reach of the driver.

5. Must have working, individual rear brakes. Must have needle bearing cross in
diﬀerential.

6. Must have wheelie–bars.

7. Must have clutch blanket or steel shield installed 270 degrees 3/8 inch thick,
and 12 inches wide.

8. Seat belt required.

9. Roll over protection mandatory. 3 bar roll cage manufactured from 2" OD x .120
wall.

10. Must have a steel ﬂywheel and clutch assembly.

11. Side shields – Side shields are mandatory. Shields must be solid and minimum
of .060” thick steel, or .120” thick aluminum.

a. All in line engines are required to have an additional inner side shield consisting
of .125” thick steel, or .250” thick aluminum inside the current side shields. This
shield is independent of the current shield and must extend from the bottom of
the head to the centerline of the crankshaft and extend the full length of the block
on each side of the engine.

13. Tie–bars securing front frame rails to rear axle housing are mandatory.

14. All drivers are required to wear full face helmets and jackets and pants with
SFI rating of 3–2a–1. Shoes SFI 3.3/5 required.

15. Must have 2–3/8” bolts in a cross pattern installed in exhaust pipe.

Harmonic Balancer:

1. All engines must be equipped with a harmonic balancer or dampener meeting
SFI Spec18.1.

Appearance:

1. Tractor must be in stock appearance, hoods, grills, & fenders.

2. All tractors that utilize tube ladder–type frames must be covered on outside
with steel or aluminum 0.060 thick.

3. Stock bell housing, stock transmission housing, and stock ﬁnal drive housing or
manufacturer’s replacement. No component chassis.

4. Maximum wheel base is 114”.

5. Maximum length is 13’ from center of rear axle to forward–most part of tractor,
including weights, not including front hitch.

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED DUE

TO YOUR SAFETY AND THE SAFETY OF OTHERS. THE

OFFICIALS’ DECISIONS ARE FINAL!

**The Head of Class/Tech Oﬃcial for each class will enforce all
of the rules! Every vehicle will be teched on a random basis
at some point throughout the season.**

7,800# 2.5 DIESEL TRUCK

Rules locked 2019, 2020, 2021

2019 7800lb 2.5 Diesel Truck – 4x4/ 8000lb Work Stock Diesel Truck- 4x4 Combo
Trucks will be ran together as one class, one payout and points. Separate rules for each
class.

**WS Rules subject to change after evaluation**

2.5 Rules

This Diesel class is designed for pickup trucks with a wide variety of performance

upgrades. The truck must be 4 wheel drive.

Weight: 7800 lb Maximum, with driver

Ballast: Hanging front weights and weight boxes (with weights only) are permitted. If
used, ballastmust be securely fastened. Weight or weight bracket must not extend more
than 60 inches from thecenter line of the axle. Final decisions rest with the technical
department. Weights and bracketsmust be removable by hand.

Batteries: The Batteries must be securely mounted. They may not be located in the
drivercompartment or forward of the radiator core support.

Body: The body must be the OEM truck body including the full bed floor. The body
must retainfull sheet metal. The complete OEM firewall and complete OEM floor pan is
mandatory. A factoryinstalled pickup bed or commercial style aftermarket bed must be
installed. No flat beds are Permitted.

Brakes: Four wheel hydraulic functional brakes are recommended front hydraulic brakes
are required.

Chassis: The OEM chassis is mandatory. The engine must be in the OEM location. The
vehicle must retain the full OEM chassis. Wheel tubs, back half conversions, tube
chassis, etc, are prohibited.

Cooling System: Radiators must be in stock location and be of at least stock size

Credentials: All drivers must have a valid state drivers license.

Driveline: An OEM transmission and transfer case are mandatory. They must have been
an option on a one ton or smaller pickup.

Driver Restraint System: The OEM restraint system or SFI 5 point harness is mandatory
and must be worn with a DOT approved seat.

Driveshaft Loops: All trucks must have at least five (6) inch wide u-joint shields around
all u-joints on rear drive shaft constructed of at least ¼ steel or 3/8 aluminum that will
safely contain the u joints and the ends of drive shafts. Any u-joint on the front axle that
can be seen from front or side of truck must be shielded the same as all other u-joints.
All shields must be securely mounted to the vehicle.

Engine: The engine is limited to a stock appearing, OEM compression engine, available
from the factory in a one ton or smaller truck. Cubic Inch limit of 444CI. Block must
circulate coolant freely. No hard filled blocks. Water pumps may be factory or electric
powered. All factory belt driven accessories, excluding the air conditioning compressor,
must be retained and powered via the crankshaft by a standard serpentine “V” belt.
Electric cooling fans are permitted. No individual runner intake manifolds. (Example:
ZZ-customs). Belt driven alternator. No deck plates.

EXAMPLE: NO HAMILTON HEADS FOR THE CUMMINS AND NO BRODIX
HEADS FOR THE DURAMAX.

Exhaust: All vehicles must be equipped to direct exhaust upward. Stacks exiting through
the fender well and hood are allowed. Two (2) 3/8 inch diameter bolts must be installed
through exhaust pipe in a cross pattern within one (1) inch of each other and as close to
the turbo as possible. This will be teched. Bolt heads welded tothe pipe or sheet metal
screws to mimic this will be disqualified.

Fire Extinguisher System: A fire extinguisher system is permitted, it must be securely
mounted All must have at least a 2 ½ lb extinguisher with working gauge mounted
within drivers reach.

Fuel: The fuel must be pump #1, #2 diesel or Soy/Biodiesel. Fuel must be commercially
available. A fuel cell may be used in place of the factory fuel tank, but must be mounted
in factory location or securely mounted in bed.

Fuel Injection Pump: The fuel injection pump is limited to cylinder number specific (I.e.
6 cylinder pump on a 6 cylinder motor). The use of multiple high pressure common rail

fuel pumps or HPOPs are permitted. P pumps that are allowed are the p3000 and the
p7100. Ag governors are allowed. No Sigma or 12 cylinder pumps allowed.

Harmonic Balancer: All engines must be equipped with a harmonic balancer or
dampenermeeting SFI Spec 18.1.

Intercoolers: Factory style or aftermarket air to air replacement only in stock location.
**Water to air coolers are prohibited. ** Any means of cooling the air before the engine,
except the air to air cooler is prohibited. **NO USE OF ICE OR WATER**

Hitch: Reinforcements are permitted. The Hitch or Reinforcements must not extend
forward of the center line of the rear axle. The hitch must be horizontal to the ground
and stationary in all directions. Bumper may be notched or removed. The hitch’s height
from the ground may not exceed 24 inches. The hooking point must have a minimum of
3 inch by 3 ¾ inch inside opening for the sled hook. The hooking point must be a
minimum of 44 inches from the center of the rear axle, to the end of the hole where the
hook touches metal to be pulled from, this is the hooking point.

Kill Switches: All trucks are required to have kill switch located on the back of the
truck, located near the hooking point. On trucks with an electric injection fuel pumps it
must have an electric shut off or disconnect for the injection pump on the back of the
truck for trucks with manual injection pumps they must have an air guillotine of the
spring loaded type, no butterfly type to kill the air intake to the engine. It is REQUIRED
to have an air shut off on all trucks. Kill switch failure will result in disqualification.

Nitrous Oxide/Propane: Nitrous Oxide, propane, or other oxygen extenders are
prohibited. All system components must be removed from the truck. No pressurized
bottles.

Rear End: Non-OEM rear-end housings are prohibited. The rear end housings must have
been for a one ton or pickup pick up. Rear axle bolts must be covered with a cap or
shield. Safety Equipment: class pullers must properly wear DOT approved helmet and
fire jacket/pants. Fire shoes & fire gloves recommended or at least leather work
boots.

Steering: The vehicle must retain the full, original OEM, factory steering gear. The
vehicle must retain the original OEM power assistance, if it was so equipped. Additional
stabilizers are permitted. Non OEM power assist methods are prohibited. Street
Equipment: Complete headlight and taillights assemblies are mandatory and must be

operative, except the right front headlight may be removed for air inlet to engine.
Complete OEM windshield and all other windows are mandatory. Driver window must
be able to operate per factory specifications (open & close).

Suspension - Front: The factory suspension configuration must be retained.
Modifications to the front suspension that would alter the original location (I.e. moving
it forward or backward) is not permitted. Strut tower braces, lower tie bars, sway bars,
and limit straps are permitted. Traction bars and devices are permitted. Air shocks are
prohibited. Hydro assist steering allowed.

Suspension - Rear: . Traction bars if installed must have a chain or cable or some type of
safety device mounted one (1) foot from the front support to catch the bar in case of
failure. The rear suspension can be solid. Air bag spring assist and air shocks are
prohibited.

Tires: The tires must be DOT street tires. Cut tires are prohibited. The vehicle must
retain the original factory wheelbase and track width. 35 inch max x 12.50. No chains or
studs. Single tires.

No Duals.

Transfer Case: Non OEM transfer cases are prohibited. It must have been an option on a
one ton or smaller pick up truck.

Transmission - Automatic: Non - OEM transmissions are prohibited. The transmission
must have been an option for a one ton or smaller truck. Aftermarket torque converters,
valve bodies and internal components are permitted. Transmission brakes are prohibited.
Any non -OEM floor mounted automatic shifter must be equipped with a spring-loaded
positive reverse lockout device to prevent the shifter from accidentally being put into
reverse. A functional neutral safety switch is mandatory. Vehicle must not start in gear.
All transmission lines must be metallic or high pressure type hose. All automatic
transmissions must be equipped with a transmission shield meeting SFI Spec 4.1 and
must be labeled accordingly. A blanket type shield must be used and appropriately
labeled as meeting SFI Spec 4.1 and it must extend from the rear of the engine block to
the rear of the tail housing with a minimum of six (6) inch overlap where it is fastened.
All vehicles using an automatic transmission must be equipped with a flex plate meeting
SFI Spec 29.1.

Transmission - Manual: Non - OEM transmissions are prohibited. The transmission must
have been an option on a one ton or smaller truck. Aftermarket internal components are
permitted. A clutch meeting minimum SFI Spec1.1 or 2.1 is mandatory on all engines.
All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All
transmissions must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or
greater. Applications for which an SFI Spec flywheel shield is not available may use a
properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing. It must
be attached to the rear of the engine block and extend rearward to the transmission with
a minimum of six (6) inch overlap where it is fastened. All transmissions or clutch
pedals will have a safety interlock switch so that vehicle will not start in gear.

Turbocharger: 2.6 STRAIGHT BORE AND 2.5 WITH .2 MAP GROVE TO BOTH BE

ALLOWED IN 2018 2.5 CLASS

2.5 TURBO RULE

S-4, GT 42, HX 50 and turbo of this type is the largest turbo allowed. T-4 mounting
flange is the largest allowed. No clipped wheels or step down covers. Billet compressor
wheels are allowed. A single .200 inch MWE groove maximum allowed. Inducer bore
must be non-removable. All air must go through the 2.5 inducer bore and MWE groove.
The wheel must protrude into the 2.5 bore 1/8 inch. Turbo checked with a 2.550 plug.6.4
Powerstrokes will be permitted to run modified turbos, as long as the atmosphere turbo
does not exceed the OEM straight bore dimension. (2.59”) No TAPERED COVERS will
be permitted.

2.6 TURBO RULE

Smooth faced intake housing, limited to a 2.6” inlet- no map ring – with all air entering
through the 2.6” opening. Intake wheel must protrude 1/8 th inch inside of opening.
S400 and GT42 and turbo of this type is the largest allowed. T-4 mounting flange on
turbo and exhaust manifold. Billet compressor wheels are allowed. Wheel must protrude
minimum of 1/8” into the inducer bore. Covers will be plugged from the back side to
verify where the wheel protrudes is a maximum of

2.6”. Turbo checked with a 2.605” plug.

No tapered or egg shaped inducer bores allowed.

Water Injection: Water injection is prohibited. All system components must be removed
from truck.

Wheelbase: The vehicle must retain the original factory wheel base and track width. Cab
and chassis trucks may not exceed 172 inch center to center of axles. Front dual-wheel
spacers may be used only with accompanying positive-offset dually style wheels.

Work Stock Rules

Chassis & Suspension

1. OEM 1 ton or less chassis required. No tube chassis or back halve conversions.

2. Factory wheelbase must be retained, Cab and chassis trucks must be no more than
172” wheelbase from center of axle to center of axle.

3. Engine must remain in original location.

4. Factory front suspension must be retained. Must retain factory OEM type steering
gear. Non OEM power assist is prohibited.

5. OEM style rear suspension is mandatory. Suspension can be temporarily blocked
solid.

6. No air bags or air shocks are allowed.

7. Limiting straps are allowed.

8. Traction bars are allowed front but must bolt to the housings. Only bracketry to bolt
them on with may be welded. You are allowed 1 straight bar per side with a maximum of
2 links or points of contact on the axle housing and/or frame going from the centerline of
the rear axle forward. Traction bars must have a center strap or chain looped around
them to prevent them from sticking in the dirt in case of bending.

9. No rear frame trusses permitted. Bracing may only have 2 points of contact.

10. Must pull off of a Reese style hitch with no part of the hitch extending forward of
the centerline of the rear axle. No part of the hitch can connect to the rear axle. No part
of the hitch may be above the top of the frame rails. Hitch must be parallel to the ground
and stationary in all directions. Hook point to be no farther forward than 44” back from
the centerline of the rear axle.

11. Hitch height is 24” max

12. Rear bumpers may be notched or removed. Sled stops permitted.

13. Hanging weight is permitted and no part of weight may extend more than 60”
forward of the front axle. Hanging weight excludes fuel tanks, batteries or other things
of the like. All other ballast must be in the bed. Nothing allowed in the cab. No heavy
skid plates allowed under the front end. Heavy skid plate is defined as anything more
than a factory OEM skidplate of OEM material.

14. Batteries may not be mounted in the cab. Batteries are to be no further forward than
the factory core support.

15. 8000# max weight limit

Driveline

1. OEM 1 ton or less transmissions and transfer cases required. No Bruno, Lencos or
reversers. No dropboxes. Aftermarket internals in stock housings is allowed.

2. SFI approved transmission blankets are recomended in trucks running an automatic
transmission. This includes Allison transmissions. They are available shelf items. If over
4000rpm they are mandatory

3. SFI approved blowproof bellhousings are highly recommended for manual
transmission trucks. If not running a blowproof bellhousing, the bellhousing must be
covered with an SFI approved transmission blanket. Manuals must be clutch assisted, no
sequential shifters permitted.

4. All trucks must have safety switches to prevent truck from starting in gear.

5. OEM 1 ton or less axles required front and rear. Aftermarket internals in stock
housings are permitted.

6. Must have working 4 wheel brakes.

7. It is mandatory to have U joint shields covering furthest rear driveshaft U joint.
Shields need to be at least 6” long and made of at least ¼” thick steel or 3/8” thick
aluminum. Any U joint visible from the side.

8. 35” DOT tires max or metric equivalent. No cutting or sharpening. No chains or studs
allowed. No dual wheels.

Truck

1. Body must be OEM truck body including OEM bed floor. Body must retain full
sheetmetal as well as OEM firewall and OEM floor boards. No flat beds.

2. All OEM glass windows must be retained. No lexan permitted. All windows must
retain factory operation.

3. Complete interior including dash board and door panels mandatory. Aftermarket seats
permitted but must be matching.

4. Hand throttles permitted

5. Factory headlight and tail light assemblies must be in place and operational. The only
exception is the right front headlight may be removed for air inlet to the engine.

6. Radiator must be in stock location and at least stock capacity.

7. Fuel tank must be mounted in stock location or in the bed.

Engine

1. Engine is limited to a stock appearing OEM make specific compression engine
available from the factory in a one ton or less truck.

2. Electric water pumps and electric fans permitted. Factory accessory drive system must
be retained.

3. No individual runner intakes (Ex: ZZ Customs)

4. No deck plates

5. OEM cylinder heads required. (Ex: No Hamilton heads for the Cummins, No Brodix
heads for the Duramax)

6. No pressurized injectibles allowed what so ever. This includes nitrous oxide, propane,
water injection or anything of the sort. All components must be removed.

7. Engines turning more than 4500 rpm must have an SFI approved harmonic balancer.

8. Fuel injection pump is cylinder count specific (6 cylinder pump on a 6 cylinder
engine). P Pumps allowed are the P3000 and P7100. No sigma or 12 cylinder allowed.
No AG governors. Dual Cp3’s Allowed.

9. Fuel must be commercially available #1, #2 diesel or soy/biodiesel.

10. Factory style or aftermarket air to air intercoolers only mounted in stock location.
Water to air intercoolers are prohibited. Absolutely no use of ice or water to cool the
intake charge. Ford 6.7L are able to utilize the factory air to water set up as long as it
remains OEM. Nothing aftermarket. No spraying intercoolers with pump sprayers or
anything of the like on the track or while you are first or second staged to go on the
track. This causes too many people in places they do not need to be.

Turbo and Exhaust

1. Turbocharger is limited to a stock appearing OEM/factory make specific charger only.
Turbochargers from different years in the same make may be interchanged, no adapters
to accept other model turbos can be used. No S300 or S400 turbo parts are allowed to be
used. 6.4 liter Powerstroke may utilitze the factory unmodified twin turbos. Turbo
inducer bore to be no greater than 2.5” both before and after the MAP groove. This will
be checked with a 2.550 plug. No forward facing MAP grooves allowed. MAP groove is
to be no larger than .200” at the wheel.

2. Exhaust must exit upward and behind the back of the cab. Tail pipes exiting on the
ground must be equipped with a 90 elbow pointing up.

3. Stacks in the bed permitted. Hood or fender stacks are not allowed.

4. Two 3/8” diameter bolts installed In the downpipe in a cross pattern are highly
recommended if the factory muffler has been removed.

Safety

1. All trucks must have a working 2.5 pound fire extinguisher on board.

2. Helmet and Fire jackets mandatory.

3. Seatbelts or 5 point harness mandatory.

4. U joint shields required, see specs for length and thickness under driveline section.

5. Kill switches mandatory on all trucks and must be located at the back of the truck. Air
guillotines are acceptable for non electronic engines. Electric kill switches are permitted
on trucks with electronic fuel shut offs.

ALL THE ABOVE RULES WILL BE STRONGLY

5,500LB. Michindoh Mods

Rules locked 2019, 2020, 2021

1. Weight

a. 5500 ibs.

2. Driver

a. Must be 16 years of age or older

3. Tires

a. Whether U.S. or metric numbering system – can be no larger than 18.4 x

38.

b. Any cut.

c. Aluminum and steel rims allowed.

d. Bias or radial / Ag tire only.

e. No duals.

4. Fuel

a. Commercial pump gas.

b. Race gas.

c. Aviation fuel.

d. No alcohol.

e. No nitros oxide.

f. No pressurized fuel tank.

5. Engine

a. American made automotive type engine no larger than eight cylinders.

b. Maximum 500 cubic inches with a 1% tolerance.

c. Must be cast iron block, heads, with visible OEM casting number – all must

be same manufacturer. No after-market, SOV, or bowtie blocks allowed. No

hemispherical style heads allowed.

d. 2 valves per cylinder.

e. 1 sparkplug per cylinder.

f. No overhead cams.

g. Must be naturally aspirated on carburetion.

h. Headers must exhaust in an upward direction.

i. All tractors must carbureted with no fabricated sheet metal intakes.

j. Distributors – any factory or aftermarket distributor can be run as long as

it is MSD 6AL compatible. k. Ignition – M.S.D. #6AL – 6420 or #6ALN – 6430 – rev
limiter box with 7200 chip – Tech oﬃcials will check RPM’s of the MSD box with an

MSD test box and chips will be tested with the same box for success and RPM’s
and shall not be any higher than 7210. If chip is over 7210 it will be automatic
disqualiﬁcation resulting in last place position of that event. MSD box must be

mounted in a location that is easily accessible and visible to the Tech oﬃcial. Chip
port must be facing an open position to get test tool on easily. Chips will be
removed and checked by a Michindoh Director after your pull. Then can be picked

up after the class is over.

6. Tractor

a. 2 wheel drive farm type tractors only – with original transmission housing

attached to the rear end – must have at least one forward gear – no planetaries.

b. Maximum length 14’’ from the center of rear axle to the furthest point

forward including weights.

c. Must have a wide front end – Front tires must track inside rear wheel

tread.

d. Must have working brakes.

7. Hitch

a. 20” maximum height.

b. Hitch point 18’’ minimum behind centerline of rear axle – the distance

behind the hitch hole may not exceed more than 1 ½’’.

c. Must be rigid in all directions.

d. Minimum opening 3 ½’’.

e. Minimum of 1’’ thick maximum 1 ¼”.

f. Turn buckles or hitch adjustor cannot be higher than the center of the rear

axle.

g. No obstruction 5’’ wide and 24’’ directly about hitch hole.

h. Welds and hitch construction will be inspected by Tech oﬃcial for safety.

8. Wheelie Bars

a. Must support weight of tractor in its heaviest class.

b. Must extend a minimum of 32’’ behind the center of the rear axle.

c. Pads must be a minimum of 5’’ inches square with trimmed corners

optional and not more than 10’’ oﬀ the ground.

d. Wheelie bars are to be mounted separate from hitch.

9. Miscellaneous.

a. There will be a required driver safety enclosure, any NTPA style roll cage,

or a minimum of 2’’ tubing or box tubing with at least 2 bars, with at least 2’’ of

clearance between inner fenders and tires – refer to attached diagram for
minimum building speciﬁcations – Tubing must be a minimum of ninety
thousandths of a inch wall thickness. Roll cages will be inspected and stamped by

tech oﬃcials with year of inspection. Sonic test equipment for steel wall thickness
may be used if needed.

b. Deadman throttle reguired – spring at the carburetor return to idle.

c. Ignition kill switch required – must stop fuel pump and ignition – must be

mounted about the hitch plate – must run electric fuel pump – easily accessible
and visible to hitchman on sled.

d. May only use an electric fan, no engine driven fans allowed.

e. Fire extinguisher – mounted within driver’s reach – must be readily

accessible and minimum of two pounds.

f. All belts must be 360 degree shrouded with 1/16’’ steel or 1/8’’ or thicker

aluminum. a. Harmonic balancer (SFI preferred) must be surrounded 360 degrees
by a min. 3/16” thick steel – also a metal strap over the center of the balancer

must be a min. of 3/16’’ thick and 3’’ wide, no larger than a 2” hole and a 3 in
strap. Anything over 2” inch whole up to 3 ½ damper must be completely covered
with 3/16” for access to the crank center bolt. Max inch by inch hole is allowed at

the timing indicator marks to allow for engine tuning. Entire enclosure must be
mounted in at least 3 solid points.

g. Universal joints, chain couplers and/or drive shaft must be surrounded

360 degree by ¼’’ or thicker steel (entire shaft length) from the automatic

transmission to the tractor transmission. Round drive shaft cylinder required. If
shaft cover is cut in half it should be bolted by 3/8 or larger of grade 5 or better
bolts in reasonable spacing for safety. Tech will check over proper spacing for

safety.

h. Automatic transmission must be surrounded by a SFI 4.1 or 4.2 rated

transmission blanket at least 18’’ in length. Blanket must be mounted to the block
with no more than a 4’’ gap between the block and the blanket and have at least

3 straps encompassing the transmission. ¼ steel may be used instead with same
dimensions applying. Must be equipped with an SFI ﬂex plate.

i. Everyone must run an automotive type automatic transmission with a

torque converter – mounted directly to the back of the engine.

j. Side shields – must be made from 1/8’’ or thicker steel or ¼’’ or thicker

aluminum – must cover from front to rear of block and cover from the bottom of
the head to 2’’ below crankshaft center line – must be secured at all four corners.

k. Tractors can be driven or are allowed to be towed around in the pit area.

10. Driver Safety Equipment.

a. Single layer ﬁreproof driving suit.

b. Full face helmet – D.O.T. approved.

c. High back molded vinyl, ﬁberglass, or aluminum race seat.

d. 4 or 5 way harness.

e. Automatic shifter must activate reverse clear lens back up light – with

unobstructed view to hitchman on the sled.

f. All non – barbed ﬁttings (cooling or fuel) must be double clamped.

g. Driver’s equipment must on tractor while being scaled. If equipment is

not on vehicle tractor will not be allowed to be scaled.

1. Kill switch must stop ignition and fuel pump.

2. Tractor must have a neutral start safety switch.

3. Backup light and kill switch must be easily accessible and seen by hitch man on

sled and may be checked randomly at pulls. At pulls colored tie straps will be
applied to kill switch to signify that tractor has been through tech.

For Technical questions regarding Mods please call Tyler Clifton cell #419-
296-1552

ALL THE ABOVE RULES WILL BE STRONGLY ENFORCED DUE

TO YOUR SAFETY AND THE SAFETY OF OTHERS. THE

OFFICIALS’ DECISIONS ARE FINAL!

**The Head of Class/Tech Oﬃcial for each class will enforce all
of the rules! Every vehicle will be teched on a random basis
at some point throughout the season.**

8,500# OPEN

$50 entry100% payback

Must also follow all general rules listed above.

Open class is subject to change at anytime by board

Must meet all safety rules to class you would normally run.

540ci maximum

HITCH

2WD Gas 30”

4WD Gas 26”

Diesel Trucks 24”

Farm Tractors 20”

Driveshaft Loops:

Drive shaft loops required (3/4” or wide), 1/8” or thicker steel (1/4” or thicker

aluminum). No more than 2” larger than the largest u–joint. If cut in half, must be bolted
within 1” from ends and a maximum of 16” apart from loop to loop (multiple loops). If
using a one piece cover it must be bolted a maximum of 6” apart the entire length and at
least 1” from ends. All fasteners must be at least 3/8”– grade 8 bolts. NO HINGE STYLE
permited. Must be securly fastened.

U–joint shielding:

2. All u–joints and yokes must have a 360 degree cover, at least 6” long (covering entire
yoke and u–joint), 1/4” thick steel (3/8” thick aluminum). Inside diameter of shield will be
no more than 2" larger than u–joint. If cover is cut in half it must be fastened no farther
than 1” from ends with at least 3/8”– grade 8 bolts. Must be bolted a maximum of 6” from
bolt to bolt. All intermidiate shafts need covered 360 degrees. NO HINGE STYLE fasteners
permited. Must be securly fastened.

Harmonic Balancer:

1. All engines must be equipped with a harmonic balancer or dampener meeting SFI
Spec18.1.

2. All vehicals are required to shield all rotating mass mounted on the front of the
crankshaft, if unobstructed. Shields to be from frame rail to frame rail and top to bottom.