2025 8,500 Work Stock Diesel 4x4 Rules

​​1. Trucks can only be entered once per class.
2. Certification will be conducted at the same time and place as all other IFPA competing vechiles.
3. Raising of the hoods will be required at every pull for tech officials.
4. The Work Stock class is designed for daily-driven, on the road pickup trucks (full bodied diesel pickup trucks). Valid registration and license are mandatory. 

Weight: 8,500 with driver included.

Ballast: Front weight bracket and suit case weights are permitted. No weight boxes, no weight in cab. Weights in bed must be secured. Weights may be no more than 60 inches forward of the centerline of the front axle. Loss of weight under green flag will result in disqualification.

Batteries: The batteries must be securely mounted. They may not be located in the driver's compartment or forward of the radiator core support. 

Body: The body must be an OEM truck body, including the full bed floor. The body must retain full sheet metal. Metal aftermarket hoods are permitted. Fiberglass is prohibited. The hood must be closed and securely latched while the vehicle is hooked to the sled. The complete OEM firewall and complete OEM floor pan are mandatory. Stock appearing front bumper.

Brakes: Four-wheel hydraulic brakes are mandatory.

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

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

Credentials: All drivers must have a valid state driver's license.

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

Drivers Restraint System: The OEM restraint system is mandatory and must be worn.

Driveshaft Loops: All trucks must have at least six-inch wide u-joint shields around the rear u-joint constructed of at least 1/4 steel or 3/8 aluminum that will safely contain the u-joint and the end of the rear shaft. All shields must be securely mounted to the vehicle. All front shaft u-joints that are visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft.

Loops: Trucks must have loops on the front and rear driveshaft. This is mandatory. 

Engine: The engine is limited to a stock appearing, no deck plates are allowed, SFI balancer and hardware, OEM make specific compression ignition engine. The engine is limited to any diesel engine available in a 1 ton or smaller pickup; i.e. transplanting a Cummins engine into a Ford is allowed. 

Exhaust: All vehicles must be equipped to direct the exhaust upward. The exhaust must exit rearward of the driver compartment. Stacks existing through the hood or fender well are prohibited. Two 3/8 inch diameter bolts must be installed through the exhaust pipe in a cross pattern within an inch of each other as close to the turbo as is practical.

Fire Extinguishing System: A fire extinguishing system is permitted. It must be securely mounted. 

Fuel: The fuel must be pump #1 or #2 diesel only. Soy/Bio diesel fuel is permitted. Off road diesel fuel is prohibited. Fuel cell in bed only. 

​Fuel Injection Pump: The fuel injection pump is limited to a stock appearing OEM engine make specific pump only. The use of multiple high pressure common rail fuel pumps are allowed. Power stroke engines with a single factory turbo may utilize a second HPOP. Pumps from different years in the same engine model may be interchanged. 

Hitch: The hitch must be a receiver style hitch, solid mounted, ridged in all directions. Receiver rear bracket must be mounted and attached no more than 8 inches forward of the rear of the frame. Reinforcements are permitted. Reinforcements must not extend forward of the centerline of the rear axle. Trick hitches are prohibited. The hooking point must be the rear most point on the vehicle and must be rearward of the stock location of the tailgate. The hitch must be horizontal to the ground and stationary in all directions. The hitch's height may not exceed 26 inches. The hooking point must have a minimum 3.750 inch inside diameter opening for the sled hook. The hooking point will be measured from the center of the clevis loop. Reece receiver with solid square shaft, clevises are allowed if using DMI or solid shaft. Breakage of the hitch is a disqualification with no measurement recorded.

Interior: A complete interior, including dashboard, door panels, headliner, etc. is mandatory. All factory controls (lights, signals, horn, windows, wiper, etc) must be retained and be operative. The use of hand throttle controls is prohibited. If vehicle is equipped with heavily tinted driver's side window the window must be rolled down during the hook.

Rear End: Non OEM rear end housings are prohibited. The rear end must have been an option on a one ton or smaller pickup. Rear axle bolts must be covered by a cap or shield. 

Steering: The vehicle must retain the full, OEM steering gear. The vehicle must retain the original OEM power steering assistance, if it were so equipped. Additional stabilizers are permitted. Non OEM power assist methods are prohibited. 

Street Equipment: Complete headlight and taillight assemblies (all) are mandatory and must be operative. Complete OEM windshields and windows mandatory. Windows must be operative per factory specifications, that is they must open and close via OEM electrical or mechanical means. 

Suspension Front: The upper mounting point for strut assemblies must be in factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened providing factory mounting points to chassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted. 

Suspension Rear: An OEM style suspension is mandatory. Lowering or raising the vehicles height with suspension modifications is permitted. Traction bars and devices are permitted. They must be bolt on only, welds are permitted for attachment to frame or axle housing. Control arms may be strengthened or replace, provided all original mounting points are retained. All rear suspensions must use at least one working shock absorber per wheel.

Tires: The tires must be DOT street tires. Cuts are prohibited. Single wheel trucks 4-35 inch max or metric equivalent. Dual wheel trucks 6-33 inch max or metric equivalent.

Tow Vehicles: Tow vehicles are prohibited; i.e. you are not allowed to pull the vehicle up to the pulling track with an ATV. 

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

Transmission Automatic: Non OEM transmissions are prohibited. Aftermarket converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non OEM floor mounted automatic transmission shifter must be equipped with a spring loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear. A functional  neutral safety switch is mandatory.

Transmission Manual: Non OEM transmissions are prohibited. Aftermarket internal components are permitted. SFI bell housing or SFI blanket required. 

Turbocharger: Open S300Borg Warner - T4 foot max with T4 bolt pattern. Must be Borg Warner front to back. No billet center sections. No cut/welded exhaust housing or compressor housings. A 4 inch compressor inlet, Exhaust housing must be visible for inspection. Stock appearing. Single stock appearing. May run Borg Warner S300 center section. No billet centers. Recast covers allowed must be OEM dimensions. No S400 parts allowed. 6.4 power stroke both turbos must be stock appearing.

Water Injection: Water injection is prohibited. All system components must be unplugged or removed from the truck. Nitrous Oxide is prohibited along with other oxygen extenders and the use of propane is prohibited. All system components must be unplugged or removed from the truck.

Wheelbase: The vehicle must retain the original factory wheelbase and track width. OEM factory dual wheel vehicles are permitted. Conversions must be factory OEM parts. 

Kill Switch: A kill switch is required.