Dirt Truck Rules
Dirt Truck Rules
The following specifications have been prepared by Fremont Speedway and Attica Raceway Park as guidelines for the construction of the Dirt Truck Division. No warranty or safety is expressed or implied as a result of this publication of rules. These rules are intended as a guide and are in no way guarantee against injury or death to participants, spectators, or others. Anything not covered by these specifications should be approved by the track officials and placed in writing. Continuous developments in auto racing and technology may mandate changes in these specifications. However, it is our intent to enforce and police these rules throughout the season. If a change is necessary, technical bulletins will be prepared and distributed in advance.
This division was developed for the fun of racing in a low cost fashion. This requires limits in various areas to keep competition on equal and fair for all participants. In order to accomplish this, if it doesn't say you can - don't! With help and consideration of the participants, this can be accomplished. Try to live within spirit of the rules. If you have any questions, please contact track officials before you are found illegal.
The only trucks to be used will be Chevy S-10, GMC S-15, Ford Ranger, and Dodge Dakota.
Stock factory steel bodies only, complete including tailgates.
Inner panels may be removed below factory beltline.
Door window opening must remain stock with complete door factory headers.
Windshield and back window openings must remain stock factory construction. No fillers in the windshield.
No hood scoops of any kind. This includes any factory options or level-up vehicles. No holes in hood.
Hood crown must remain factory stock. No raised hoods of any kind!
Stock bumpers only which may mean also be reinforced. No visible crash bars- front or rear.
Bumpers must be no lower than 12 inches. No higher than 16 inches to the bottom. Rubber truck nose is allowed. However bumper height must remain per rules. Bumper can be mounted behind rubber nose. No other rubber nose will be allowed.
Top of bumper may not be any higher than 2 inches from bottom of tailgate.
Wheel opening flanges must be turned inboard.
Stock appearing rockers (size & location). No body-side skirts below rockers. No rear skirts. This measurement from the top of box to bottom of rocker must be no longer than 32 inches.
Truck must have front and rear firewall with adequate protection. No holes showing.
Rub rails made of one-inch square tubing will be allowed. Rails must be tapered and be mounted tight against body and be free of sharp edges.
Rear deck may be covered with aluminum or steel and have a hinged lid over fuel cell.
Rear deck cover must be flat and flush with top box. Must run full length of box.
All trucks must be neatly painted and lettered. The truck must have a number of no less than 18 inches on each door and roof.
Badly damaged trucks will have to be repaired. Any sharp edges must be repaired or made smooth.
Windshield visor ok. No more than 6 inches in width. Must be mounted at the extreme top of windshield opening. This will be measured at the middle of the windshield down.
Steel or aluminum body sides allowed. Factory body must keep 4 inches from bottom of window.
No body panels can have hinges to allow air to escape.
No Sail panels on rear down bars allowed.
Spoilers must be mounted to rear of the bed.
Spoiler Blade will be a maximum of 8 inches.
Spoiler Blade must be flat. Maximum of 1 inch wicker bill. Any spoiler angle is ok.
Spoiler may not extend past sides of the bed.
Spoiler sideboards will be no larger than 100 sq. inches.
Only 3 supports will be allowed.
Stock truck frames must be used.
Frames must remain stock width.
Frame supports may be added.
Frame lighting holes not allowed.
Frame rails must remain stock front to rear.
Lowering of engine is allowed may not remove the lower portion of factory cross member. Frame must be plated in if material is removed.
Notching frame to lower seat is ok. However must keep bottom 2 inches of factory frame rail and must have square tubing put in this area to support frame.
Roll cages will be 6 point design with 1 1/2 inch minimum diameter with .095 wall tubing with a minimum of 3 bars in each door. Each door bar must be of single piece construction.
Saddled tubing joints recommended. If not, gussets required.
Roll cage offset allowed on right hand side only.
The following wheel bases will be used:
Chevy S-10/ GMC S-15 Ford Ranger Dodge Dakota
Short Bed 108" 108" 112"
Long bed 118" 114 124"
Ext. Cab 123" 125" 131"
Update: Racing Leaf springs can be added to Dodge trucks this will cause the trucks to have altered wheel bases. As long as the wheel base on all Dodge’s are no more than 4 inches shorter than factory this will be allowed to help keep cost down. (example: short bed factory length is 112" can now be 108"at ride height.)
Suspension, Springs ,and Shocks:
Front: Racing coil springs may be used with a minimum of 5 inch diameter - front only.
Weight jack bolts will be allowed on front coils only.
Upper A-arms may be tubular, Upper A-arms may be notched for weight jack bolts. Upper A-arms must have a connected cross shaft. Upper A-arms may run parallel to the frame.
Lower A-arms must be factory and may have a maximum extension of 2 inches. Extension must be straight out. Lower A-arms must be mounted in factory mount.
Any factory spindle may be used. No aftermarket or tubular spindles may be used. No wide 5 hubs.
Rear: Rear leaf springs must remain in stock locations, using factory front mount. No rear coils
Rear sliders or shackles allowed. Shackles must be mounted in factory location. If rear sliders are used they may be placed within 6 inches of factory spring mount. Rear spring cannot mount any higher than bottom of the frame.
Aftermarket rear leafs are allowed. However factory wheel base must remain.
Any rear end torq-link may be used. (examples, pull bar, lift bar, biscuit bar) No coil-overs allowed, however coil eliminators ok, shock and spring must be separated!
No four link or z link type suspensions allowed.
Shocks: Racing shocks may be used. Only one shock per wheel.
Gas shocks allowed but can't have schrader valves.
Oil shocks can be adjustable.
No coil-overs or coil-over eliminators allowed on any corner of the truck.
Other: Drive shaft must be painted white. Strap for drive shaft required.
Steering must remain stock to frame. Original equipment only. Aluminum tie rods ok.
Minimum of 2 universal joints in steering shaft.
Steering quickener may be used.
No quick changes.
9 inch Ford rear end allowed.
Floater rear end may be used. No aluminum. No wide 5 hubs.
Rear end may be locked.
Maximum rear truck width of 74 inches as measured from outside wall of left rear tire to outside sidewall of right rear tire.
Rear end must mount to factory pin location. Must have 2 U-bolts on each side holding rear end to the springs. Left side locked rear end is ok. Rear ends cannot spin on own axis!
Must have 4 working brakes
Dual master cylinder/ pedal assembly with brake adjuster may be used.
Disk brakes on rear end ok.
Aluminum calipers on rear end only ok!
No brake shutoffs of any kind.
Wheel and Tires:
Any 8 inch by 15 inch steel racing type wheel only.
No aluminum wheels.
Bead locks ok.
Any brand 8 inch racing tire allowed. NO STREET OR HIGHWAY TIRES ALLOWED.
Wheels must pass go/no gauge.
No tire bleeders allowed.
Any engine may be used in any truck. (For example a Chevy in a Ford truck)
Engine setback #1 spark plug will be no farther back than the center of ball joint.
No aluminum heads or blocks.
Only 1 Holley 4412-2 barrel carburetor allowed. Must pass Holley No-Go gauge. Choke plate must be removed. No Dominator, Predator, or Weber style.
Adapter plate ok. (Remember NO hood scoops)
Aluminum intakes ok.
Exhaust may not protrude past side sheet metal.
No crank trigger ignition. No magnetos.
Mufflers are required. (Schoenfeld Muffler 112535 or 113035)
Radiators must be in front of engine.
Overflow can must be used.
Shroud must cover upper 180 degrees of the fan. Shroud must be metal and completely cover fan.
Electric fan ok.
No oil coolers allowed in driver’s compartment.
Any OEM transmission may be used. Must be stock appearing. Automatic or standard ok.
Front pump drives ok.
No quick change transmissions.
Bert or Brinn type transmissions ok.
No dog clutches.
Any stock clutch or multi-disk may be used.
Fuel cell in steel can is mandatory.
Must be mounted behind real axle with minimum of 2-2 inch by 1/8 inch steel straps around fuel cell.
Fuel filler may not extend outside of body.
No electric fuel pumps.
Fuel lines must run under floorboards.
Pump gasoline or straight alcohol (methanol) only.
No nitro or nitrous oxide systems.
Helmets required and must pass inspection. (Snell 2015 at least) 2020 highly recommended if you have to purchase a new one.
Flame retardant driving suit, driving gloves, and driving shoes required. ( Double layer suit with Nomex underwear ) Highly recommended
Competition type seat belts must be used. Lap belt and shoulder harness must be 3 inches in width minimum. Belts cannot be over 2 years old. ( Suggest bold color from drivers suit)
Anti-submarine belt required.
Aluminum racing seat is required. Seat must be mounted to roll cage in at least 4 places. 2 on the back and 2 on the bottom. (Full containment seats are highly recommended)
Must have approved padded headrest.
Roll bar padding required.
Safety bars required in front of the driver.
Driver preference on fire extinguisher inside cab.
Battery cannot be located in driver's compartment. Battery must be mounted inside the frame rails.
All trucks must have tow hooks front and rear.
Track officials have the right to ask for the removal any decal or signage deemed to be disrespectful, inappropriate, or offensive.
Any truck found illegal will be running for show up points and show up pay only if you/ they decide to run the feature. Rest of money earned will be going to drivers point fund at the end of the year. Trucks may also be suspended.
Rules may be added or changed as needed to better the division. If you have any suggestions on possible rule changes: Have cost of parts, why you are requesting the change.