Section 16 - PRO STOCK DIESEL 4X4 3.6 TRUCKS (PSD36)¶

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

16.1 - General Rules¶

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”.
Hitch point must be easily accessed. No “trick” type hitches permitted.
The hitch must be stationary in all directions.
The hitch must be frame mounted.
The hitch must be mounted on the center line of the rear axle or behind.
Hitch must not exceed a maximum of 25° angle from pivot point to hook point.
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.
No slotting of holes for adjuster attachment.
No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle.
Pivot pin of drawbar can be no farther forward than center line of the rear axle.

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

Maximum engine size will be 460 cid.
Engine must come from factory in one ton or smaller diesel pickup truck.
Front of engine block can be no farther forward than 17” of centerline of front axle.
Billet blocks and heads are allowed with OEM specs, replica to be considered legal must retain stock bore spacing and operate with the stock crankshaft for the model without alterations for chassis mounting.
The fuel injection pump is limited to cylinder number specific (I.e. 6-cylinder pump on a 6-cylinder motor). Ag governors permitted. No Sigma or 12-cylinder pumps are allowed.
The use of multiple high-pressure common rail fuel pumps or HPOPs are allowed.
Radiators, if required, must be in stock location and be of at least stock size
All factory belt driven accessories, excluding the air conditioning compressor, must be retained and powered via the crankshaft by a standard serpentine or “V” belt. Electric cooling fans are permitted.
All trucks must be equipped to direct exhaust upward. Hood stack permitted. Two 1/2 inch diameter bolts must be installed through exhaust pipe in a cross pattern within 1 inch of each other, as close to the turbo as possible.
All engines must be equipped with a harmonic balancer or dampener meeting SFI Spec 18.1.
Intercoolers are allowed.

Turbocharger must have smooth faced intake housing, limited to a 3.6-inch inlet, (no map ring) with all air entering through the 3.6-inch opening. Intake wheel must protrude 1/8-inch inside of opening.

17.Tires: May run DOT approved tire or bar tire.
1. DOT Tire: maximum tire height 35”, no studded tires or chains. No alteration to DOT tires allowed. No sanding, siping, shaving, grooving or burnouts. Excessive wear or modification to OEM configuration is not allowed and will be subject to tech official’s review. Dual rear wheels are permitted on rear axle only. Maximum of 6 tires.
2. Bar Tire: Maximum tire circumference or 112”, when inflated to 30psi with original bar, not to exceed 18 inches in width before cutting. Maximum of 4 tires.
3. No combination of (bar/DOT) of tires permitted..
Rear axle bolts must be covered by cap or shield.
Welded rear end suspension is allowed.
Aftermarket steering is allowed.

Ballast is permitted.
Front hanging weights are allowed, weight is not to exceed 60 inches forward of the center of the front axle. This will be measured from the center of front axle to end of the weight assembly.
Ballast may be added in the bed of the truck. Weight box permitted only for weight.

Drive train will consist of the following: Any front axle, any transfer case and any rear axle. No planetaries permitted, If using an Automatic Transmission:

VP Racing Fuel is the only fuel that is allowed for use in all pulling vehicles. VP DX fuel is allowed.
A \$50 fine will be assessed for lack of fuel and water test ports for all classes.
A \$50 fine will be assessed for any minor infractions of fuel or water quality.
Nitrous Oxide is prohibited. No other oxygen extenders are allowed. All system components must be removed from the truck.
Propane is prohibited. All system components must be removed from the truck.
A Fuel cell is permitted in the factory location or mounted securely in the bed.