1. Ballast is permitted. Hanging weights may not extend more than 60 inches from the center line of the front axle.
2. Batteries must be securely mounted. They may not be located in the driver compartment.
3. The body may be any 3/4-or 1-ton full-sized pickup truck body. The body must retain full sheet metal. The full bed floor must remain intact. Alternatively, two hundred pounds of movable weight must be placed rearward of the centerline of the rear axle in lieu of the bed floor. The complete OEM firewall and complete OEM floor pan is mandatory. Metal after-market hoods are permitted. Fiberglass is prohibited. Tilt-front ends and bodies are permitted, as long as other class rules are met. The hood must be closed and securely latched while the vehicle is hooked to the sled.
4. 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.
5. Driveline Open
6. The OEM restraint system is mandatory and must be worn snugly. Alternatively, a three inch-wide driver restraint system labeled as meeting SFI Spec 16.1 is permitted; this system includes a crotch strap and must be updated at two-year intervals from date of manufacture.
7. All trucks must have at least six-inch wide u-joint shields around the rear u-joint constructed of at least 1/4-inch steel or 3/8-inch aluminum that will safely contain the u-joint and the ends of each shaft. In addition there will be at least one shaft loop in the middle of the drive shaft. All shields must be securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft. On vehicles so equipped, all intermediate drive shafts must be fully enclosed with a 5/16 inch. steel or 3/8 inch aluminum shield. The shield must cover the entire length of the shaft and the universal joints and yokes at each end.
8. The engine block must have been available as a factory option on one-ton or smaller Pick-up trucks. No aftermarket blocks allowed. Commercially available lube pump is allowed.
9. All vehicles must be equipped to direct exhaust upward. Two , minimum grade 5, 3/8 inch diameter bolts must be installed in the exhaust pipe in a cross pattern within one inch of each other as close to the final turbo as is practical.
10. The fuel must be pump #1/#2 diesel only. Soy/Biodiesel fuel is permitted. NITROUS OXIDE and other oxygen extenders as well as the use of PROPANE is also prohibited. All system components MUST be removed from the truck.
11. Fuel injection pump, maximum “P” series pump allowed. One plunger permitted per cylinder.
12. All trucks must be equipped with a driver operated fuel shutoff capable of blocking fuel flow to the injection pump. A three-way dump valve is recommended.
13. All fuel tanks, lines, pumps, valves, etc. must be located outside of the driver compartment and within the confines of the frame and/or steel body. Fuel pressure gauge isolators, with steel-braided line, may be mounted on the firewall.
14. All engines turning over 4,500 rpm must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1. A shield across the frame under the front of the motor shielding the damper and engine fan area is required.
15. The hitch must be constructed of solid material that is properly attached and braced. The hooking point must be at least 44 inches rearward from the centerline of the rear axle. The hitch must be horizontal to the ground and stationary in all directions. The hitch’s height from the ground may not exceed 26 inches. The hooking point must have a minimum 3.5-inch inside diameter opening for the sled hook. The hooking point will be measured to the center of the clevis loop.
16. The vehicle must be equipped with one seat for the driver; it must be properly installed.
17. A sled-and driver-operated spring-loaded emergency air shut off is mandatory. The cable must terminate into a two-inch diameter steel ring.
18. It is highly recommended that drivers wear a jacket meeting at least SFI specification 3.2A/5 or 3.2A/15.
19. Rear Axle and hub bolt shield required to be minimum of 0.060” thick minimum diameter of axle end and hub bolts to be covered on both front and rear axle. Axle and Hub Bolt Shield Required to be Minimum 0.060 Thick. Minimum Diameter of Axel End and Hub Bolts to be Covered on Both Front and Rear Axles. Mounting Shield Cannot Be Mounted to Axle End or Hub Bolts. A Hole May Be Installed in the Center of Front Shield So hub Lock Can Be Operated, So Long as Hub End or Axle Bolts are Covered.
20. The front axle centerline must remain in the factory location.
21. Rigid or 4-link suspensions are permitted. Air suspension is permitted; the compressor must be disconnected.
22. Tires must be DOT street tires only. Cut tires are prohibited.
23. Tow vehicles are permitted
24. Aftermarket torque 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. All transmission lines must be metallic or high-pressure-type hose. All vehicles with engines turning over 4,500 rpm using an automatic transmission must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted; it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front of tail housing with a minimum six inch overlap where it is fastened. All non-blanket type shields must incorporate two (or one, per manufacturers instructions) 3/4 inch by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission pan is labeled as meeting SFI Spec 4.1. All vehicles using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.
25. Any engine turning over 4,500 rpm must have a clutch meeting minimum SFI Spec 1.1 or 1.2. All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All trucks with engines turning over 4,500 rpm with manual 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 block and extend rearward to the transmission with a minimum six inch overlap where it is fastened.
26. All vehicles are limited to a single turbocharger with an inducer bore on the atmosphere compressor housing no larger than 3" measured at the smallest diameter area of the compressor wheel. Compressor wheel must protrude through housing at least 1/8 inch. The inducer bore will be measured using a 3.05 inch plug. All provisions allowing air to the wheel other than via the bore are prohibited. Map enhancement grooves allowed
27. Water injection is permitted. Alcohol, methanol, and all other flammables are prohibited.
28. The minimum allowed wheelbase is 90 inches; the maximum allowed is 180 inches. The maximum wheelbase variation from left to right is one inch; the measurement will be made using a X pattern (LF-RR and RF-LR). The maximum allowed tread width is 102 inches.
29. Drivers must wear a DOT approved helmet. Helmet must be fastened. Opened body vehicle drivers must also wear eye protection.