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Section 14 – LIMITED PRO STOCK DIESEL 4X4 3.0 TRUCKS (LPD30)

Unless specifically outlined below in the class specific rules, the Truck General Rules and the overall General rules outlined above will apply.

14.1 - General Rules

  1. 3.0 Diesel trucks will compete at a maximum weight of 8,000 lbs.

  2. The OEM Driver Restraint System is mandatory and must be worn.

  3. Exhaust manifold and exhaust turbo blankets are required.

  5. No traction control permitted.

14.2 - Drawbar/Hitch

  1. The hooking point is defined as the point of contact between the hook of the sled and the rearmost part of the opening of the hitch (i.e. - where the hook drops).

    1. Hooking point must have a minimum of 3 inch by 3 ¾ inch inside opening for the sled hook.

    2. Hook point to be no closer than 44” of centerline of rear axle.

    3. Maximum hitch height of 26”.

  2. Hitch point must be easily accessed. No “trick” type hitches permitted.

  3. The hitch must be stationary in all directions.

  4. The hitch must be frame mounted.

  5. The hitch must be mounted on the center line of the rear axle or behind.

  6. Hitch must not exceed a maximum of 25° angle from pivot point to hook point.

  7. Drawbar height adjustment link if attached to rear differential housing the attaching point must be at axle centerline or below. The drawbar adjusters cannot attach to anything above the centerline of the rear axle. The adjusters must go down from the drawbar. The adjusters can only go straight downward vertically or towards rear differential housing.

  8. No slotting of holes for adjuster attachment.

  9. No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle.

  10. Pivot pin of drawbar can be no farther forward than center line of the rear axle.

14.3 - Body / Chassis

  1. The body must be the OEM truck body. The body must retain full sheet metal, aftermarket hoods are permitted. The hood must be closed and securely latched while the vehicle is hooked to the sled.

  2. 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.

  3. A complete firewall is mandatory. No holes except for controls. Must be a minimum of one of the following materials, 1/16” aluminum, 1/16” steel or 1/8 Lexan may be used. Firewall must extend downward to bottom of the frame.

  4. Must have tonneau cover and tailgate if bed floor is removed.

14.4 - Engine

  1. 460 cubic inch max.

  2. No aftermarket blocks.

  3. The engine is limited to a stock appearing engine, which can be interchanged between Dodge, Ford, Chevy, etc. as long as they came in a one ton or smaller pickup truck from the factory. The complete engine must have stock appearance except where otherwise noted in these rules.

  4. Aftermarket intake manifolds are allowed.

  5. Max one P7100 (2 5/8”w 9 9/16”L 8 3/16”H pump body or p8600 pump. The use of multiple high-pressure common rail fuel pumps is legal. 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. P7100 pumps are allowed to run RSV (ag governors).

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

  7. Intercoolers: Ice water intercoolers are allowed.

  8. A fire extinguisher system is permitted.

14.5 - Turbocharger

  1. The vehicle is limited to a 3-inch slick bore without map ring. All provisions allowing the air into the wheel other than via bore is prohibited. Compressor wheel must protrude into 3.0” bore for 1/8”.

  2. No removable plugs or reducers allowed to reduce to legal spec.

  3. The vehicle driver will be responsible for making compressor wheel accessible for tech personnel to measure bore.

14.6 - Tires, Wheels, Suspension, Steering

  1. The tires must be DOT street tires. Maximum size of a 35 inch 12.50 or metric equivalent allowed. Cut tires are prohibited. 102-inch maximum outside tire to outside tire. Rear duals are allowed.

  2. The maximum wheelbase is 158 inches.

  3. Rear axle bolts must be covered by cap or shield.

  4. Rear dual wheels allowed.

  5. Welded rear end suspension is allowed.

  6. Aftermarket steering is allowed.

14.7 - Weights / Weight Boxes

  1. 7,500 lbs. minimum weight – 8,000 lbs. maximum weight.

  2. Ballast is permitted.

  3. Front hanging weights are allowed, not to exceed 60 inches forward of the center of the front axle. This will be measured from center of front wheels to end of weight assembly.

  4. Ballast may be added in the bed of the truck.

14.8 - Transmission / Driveshaft

  1. Open driveline from flywheel back is allowed.

  2. Any transmission or transfer case allowed.

  3. All trucks must have at least a six-inch-wide shield around the rear u-joint constructed of at least ¼ inch steel or 3/8-inch aluminum that will safely contain the u-joint and the end of the rear shaft. Any front driveshaft 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.

  4. All shields must be securely mounted to the vehicle.

  5. Recommend that all u-joints be covered, and drive shafts have the 3-additional hanger loops as specified in the truck general rules.

  6. If using an Automatic Transmission:

    1. Aftermarket torque converters, valve bodies and internal components are permitted.

    2. Transmission brakes are prohibited.

    3. 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.

    4. A functional neutral safety switch is mandatory.

    5. All transmission lines must be metallic or high-pressure type hose.

    6. All vehicles 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 and must be appropriately labeled as meeting SFI spec 4.1. It must extend from the rear of the block to the front of transmission main body and the bellhousing area is to be completely covered with a six-inch overlap where it is fastened. All non-blanket type shields must incorporate two (or one, per manufacturer’s instructions) ¾ 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

    7. All vehicles using an automatic transmission must be equipped with a flex plate meeting SFI spec 29.1 and covered by a flex plate shield meeting FIT spec 30.1.

  7. If Using a Manual Transmission:

  1. Aftermarket internal components are permitted.

  2. A clutch with minimum SFI spec 1.1 or 1.2 is mandatory on all vehicles.

  3. All manual transmissions must be clutch assisted.

  4. Sequential shifters are prohibited.

  5. All vehicles equipped with a manual transmission must have a flywheel shield labeled as meeting SFI spec 6.3.

  6. 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 that bellhousing. It must be attached to the block and extend rearward to the transmission with a minimum six-inch overlap where it is fastened.

14.9 - Fuel & Water

  1. Fuel must test 150 or below with all vehicles.

  2. VP Racing Fuel is the only fuel that is allowed for use in all pulling vehicles. VP DX fuel is allowed.

  3. A \$50 fine will be assessed for lack of fuel and water test ports for all classes.

  4. A \$50 fine will be assessed for any minor infractions of fuel or water quality.

  5. Racing fuel cells are permitted.