Pro Stock 4 X 4 Trucks
WEIGHT CLASS: 6200 POUNDS
1. Weight Class
3. Weight box or
weight bracket is allowed to be 193'' from the center of the rear axel to the
front of weight. Weights can not be more than a maximum of 60” from the center of the front
axel. Weights in the bed must be
secured. No weights are allowed in
4. Any DOT
approved tire allowed. Maximum Tire Size 36 X 16. Tire
Sharpening allowed, no more than 3/32'' (0.093) clearance in backside of tread. No cut, grooved bar tread, or tractor type tires allowed.
5. Pump gas or
racing fuel allowed. No alcohol, Nitro or Nitrous allowed.
Any truck that is equipped with a Nitrous bottle, it must be removed from
6. Open headers
allowed. Exhaust must discharge
under the truck to the rear. No
side or down discharge of exhaust toward the ground allowed.
7. Any intake
manifold and single carburetor combination allowed. Single carburetor may be any
size. No Sheet metal intake
manifolds allowed. Engine must be naturally
aspirated, No supercharger or turbocharger allowed.
8. Kill switch or
breakaway switch required within 24” of hitch point.
All kill switches will be tested at the scale for proper operation.
Kill switch must kill the engine and any electric fuel pumps.
9. Trucks with
Standard transmissions must have a steel flywheel and a blow-proof bell housing
or S.F.I. blanket. All automatic
transmissions must have an S.F.I. blanket.
10. Drive Shaft
loops for the front and rear drive shafts and U-joint shields are required.
All U-joints must be shielded 360 degrees with 3/8 aluminum or 5/16
steel. All shields must be 6”
long minimum and must be centered over the U-joints.
The inside of the shield must not be more than 2” larger then the
U-joint. Each truck must have 1
loop for the front drive shaft and 3 loops for the rear drive shaft.
11. All drive line
components must be for 1 ton and under trucks.
No drop boxes or reversers.
12. Maximum hitch
height allowed is 26” from the top of the hitch to level ground. (Hitch can be lower) Hitch must be a
receiver type-towing hitch or a special constructed pulling hitch. No bumper hitches.
Hitch must be rigid in all directions with a minimum of a 3” to 3
opening. No vertical hitch or
openings. From point of hook to
centerline of rear axle shall be no less than 30% of truck wheelbase and shall
not slope any greater than 33 degrees to hitch point. No hitch
supports or adjusters. If the hitch is fastened to the rear axel housing
it shall be above the center line of the rear axel. The Pivot pin of the
drawbar can be no further forward than the centerline of the rear axel.
No hitch supports or adjusters. If the hitch is fastened to the rear axel housing it shall be above the center line of the rear axel. The Pivot pin of the drawbar can be no further forward than the centerline of the rear axel.
modifications are allowed. Any
blocked or solid suspension must be safely fabricated and securely fastened to
the frame as determined by the tech inspector. No Springs required
14. Each truck is
required to have an ABC fire extinguisher in the cab and within reach of the
driver. Extinguisher must be a
minimum of 2 ½ lbs.
15. Driver must
wear a fire suite (jacket and pants), helmet and must wear leather boots or SFI
type fireproof shoes while pulling. Driver must wear a seat belt while pulling.
16. Truck must have
17. Truck must have
rear bumpers at least 8” vertical in height and with a maximum height of 24”
off the ground
18. Each truck must
have a fan shroud and the Radiator must be ahead of the motor between the grill
and the engine.
19. No gas tanks,
fuel lines or batteries allowed in the truck cab unless factory installed.
If a fuel cell is used the replace the original tank, the fuel cell must
be securely mounted in the bed of the truck and shielded entirely by .60 Steel
or aluminum. A fuel tank may be mounted in front of the truck between
the weightbox and grill of the truck.
A fuel tank may be mounted in front of the truck between the weightbox and grill of the truck.
20. Axle shields are required. Shield to be .060" thickness steel or aluminum. Shield not to be mounted to axle ends or hub bolts. A single hole may be cut in one to allow locking of hubs.