The Idea or Spirit of the class is to have the modified trucks and low entry truck class that don’t fit anywhere else have a home to race with likeminded individuals with the passions to bang doors but not the budget to do it in a TT. The rules are broad enough to allow tube chassis trucks with steel cabs, previously
Full Fiberglass 1400 trucks but does not encourage the building of sandbag style trucks. We would like to see people race within their budget.
No mixing of rules across classes. Please follow the rules of your prospective class. **Once you enter and race in the desert challenger Class you cannot enter in a lower class for the remainder of the calendar season.
**Allow previously allowed fiber glassed trucks. (No new ones)
This class is an open class and all components will be considered open unless restricted herein
Doors & Latches
Doors must remain functional and in original stock location with original hinges and working latch.
Secondary positive latching devices mandatory if nets are attached to doors.
Chassis & Body
Must have factory metal cab.
PRODUCTION FULL-SIZED TRUCK / SUV’S
Vehicles built from a two or four-wheel drive full-sized truck / SUV. Vehicle must have been series produced in quantities of at least 4000 units within a 36-month period.
There must be a minimum of 4000 series vehicles sold to the general public in the U.S.A. within a 36-month period. Vehicle must be readily available to the general public in the U.S.A. Vehicle must be marketed as full-sized truck /SUV.
Class entrants shall comply with all class and applicable general regulations
Body, engine, and chassis must be from the same manufacture. This is an open class and all parts will be considered open unless restricted herein. Vehicles that have previously raced and do not meet our current rules or regulation, may submit for
Technical Director approval.
Front suspension must be of the same configuration as originally produced
and installed on the chassis to which it is mounted. Suspensions may be strengthened and reinforced
in any manner so long as original stock concept (a-arm, I-beam, etc.) is retained. Pivot points are open.
Ball joints may be of any manufacturer. Spindles may be of any manufacture and may be reinforced.
Vehicles with straight axle front ends may modify suspension configuration to utilize a four link and c
oil over shock system. Rear suspension must utilize an automotive straight axle differential. Suspension s upport system is open (quarter-elliptical, coil-over shocks, four-link, etc.). Outboard mounted rear springs are permitted. Spring rates and capacities are open. Front and rear wheel travel is open.
SHOCK ABSORBERS & BUMP STOPS
Number of shocks and mounting methods are open. Mounting points may be strengthened and design modified. Remote mounted shocks are permitted. Hydraulic bump stops are permitted. Front shocks
may not protrude through hood.
Secondary suspension is permitted.
WHEELS & TIRES
MAX SIZE 40”
FASTENERS STEERING & BRAKE COMPONENTS
Steering box location is optional. Steering box mounting may be reinforced by adding material. Power steering is permitted. Steering box may be replaced. Steering parts (tie rods, tie rod ends, idler arms, relay rods, and turning arms) may be specially made. Heim joints are optional. Any manufacturer steering wheel may be used.
Safety fuel cells are required. Fuel cell location must be behind cab. Fuel cell may be sunk into the bed. Rear frame cross members may be relocated or replaced in order to sink fuel cell.
ENGINE TRANSMISSION & DRIVELINES
ENGINE LOCATION & DISPLACEMENT
Engine must be produced by the same manufacturer as frame and body.
Any displacement engine may be used. After market block may be used, if aluminum block, it must be same manufacture as frame and body. Engine must be readily available to the general public in the USA. Engines must be mounted in the front of the vehicle like a truck with all pulleys facing forward. No mid-engine chassis configuration. Any make of automotive carburetor may be used but is restricted to one (1) four-barrel.
Stock factory fuel injection or any one (1) aftermarket Throttle Body Injection (TBI kit) may be used with approval of Tech Director. Special Note: Ford Production turbocharged V6 gasoline engine (EcoBoost)
allowed in Class 8000. Items with no restrictions include: A. Strengthening and balancing. B. Valve train
and camshaft. C. Bore and stroke. D. Pistons E. Blueprinting. F. Oil and water-cooling systems. Dry sumps are permitted. G. Heads H. Air cleaners. I. Fuel pumps. J. Exhaust systems (must have muffler or spark arrestors.) TRANSMISSION Transmission is open.
Rear axle assembly must use an automotive type straight axle housing and third member.
Gear ratios, carriers, axles, and floating hubs are optional. Knock-off hubs are permitted. Axle tubes may be replaced.
Any Manufacturer’s racing seat may be used but must remain in the approximate stock location.
If the full stock cab is not being utilized, metal sheeting must be installed on the sides of the rollcage by the occupants to afford protection in event fiberglass doors are damaged or missing. The sheet metal must extend from the front firewall to behind the seats and from the floor to the horizontal bar at t he approximate height of the door’s windowsill. Sheet metal must be attached to the top of the cage if a fiberglass roof is used. Vehicles utilizing a stock cab are exempt from the sheet metal sides but it is recommended if utilizing fiberglass doors.
Pro Truck SPEC
Full-Size Two-Wheel Drive Truck
Single class of truck built to a set of specifications for this class. Developed to be a cost-effective race truck utilizing components designed specifically for this particular class
Entrants in this class shall comply with all applicable general regulations. Pro Trucks are based on full size trucks from Chevy, Dodge, Ford, GMC and Toyota. Exterior must have the appearance of one of the five above manufacturers Front and rear suspension must be of the same manufacture, shape, size and configuration as originally produced and installed on the chassis to which it is mounted. All suspension components will remain in the original stock locations and original stock mounting methods maintained. All components will be original manufacturer’s design and must be stock as delivered from the manufacture. A-arms, I-beams and front axles must remain stock as delivered on the chassis to which it is mounted. Suspension parts must remain stock shape, size and configuration as delivered from the manufacturer. Stock pivot points must be retained. Front and rear springs must remain in stock locations and retain original stock concept (leaf, coil, torsion). Rates and capacities of springs are open. Wheel openings in fenders may be enlarged for tire clearance by a maximum of 2”.Body lift kits are allowed up to a maximum of 3”. Riser blocks may be used only on the rear of the vehicle and must be made of a solid material that will not crumble.
SHOCK ABSORBERS & BUMP STOPS
Two shocks per wheel, maximum. Shock location optional. No remote mounted shocks. No air shocks.
No secondary suspension allowed.
WHEELS & TIRES
Any manufacturer’s wheels and any manufacturer tires are allowed as long as guidelines are maintained.
STEERING & BRAKE COMPONENT
Steering box must remain stock as delivered from the manufacturer. Steering box mounting may be reinforced by adding material but remain in the stock location. Steering parts (tie rods, tie rod ends, idler arms, pitman arms, relay rods and turning arms) must remain stock as delivered from the manufacturer. Any manufacturer’s steering wheel may be used
Turning or steering brakes are not allowed.
CHASSIS & BODY
Manufacturers specified year chassis and body combination must be retained. Original wheelbase must be maintained. Frames must retain original stock configuration. No lengthening or narrowing of frame is allowed. No removal of material is allowed. Body must maintain the original shape, size, configuration and appearance. Additional mounts or parts for body strengthening may be added. Mounting location (vertical, horizontal, lateral) in relation to frame and mounting method on frame must remain original stock. The measurement from the center line of the front spindle to the
back of the B-pillar post must remain stock. Internal body structural members must remain intact. Holes may be drilled or cut for clearance of roll bars. Pickup bed floors must remain intact except for removal of material for
sinking fuel cells. Hoods, trunk lids, doors and bedsides must remain stock as delivered by the manufacturer. Tailgates are optional. Stock grill assemblies are required. Safety glass windshields, side and rear glass are optional.
Ignition system must remain stock as delivered from the manufacturer. Aftermarket spark plugs and wires are allowed.
Any manufacturer’s battery may be used. Position may be relocated. If battery is mounted in the s tock location, additional reinforcement is recommended.
Any manufacturer’s lights may be used, but stock headlight openings must be retained. Rear collision lights are mandatory.
STARTERS FUEL SYSTEM FUEL
Available racing gas or pump gas may be used.
Safety fuel cells are required. Fuel cell location is optional. Fuel cell may be sunk into bed and rear
frame cross-member may be relocated, removed or replaced in order to sink fuel cell. Only a minimum amount
of material may be removed to sink fuel cells.
FUEL FILLERS LINES, VENTS, & CAPS ENGINE, TRANSMISSION & DRIVELINES ENGINE & ENGINE DISPLACEMENT
Any small block V8 engine may be used provided it is listed and delivered by the above manufacturers. Engine displacement is limited to 360 cubic inches. Stock block and heads as delivered must be used but may be modified. All internal parts are open. Engine must be located in the stock mounting location as delivered from the manufacturer. Any make and type of exhaust may be used. Smog equipment may be removed.
Any make of automotive carburetor may be used but it is restricted to one (1), four (4) barrel. Stock factory fuel injection may be used. Any make of automotive intake manifolds and air cleaners may be used. Cutting of the hood for clearance of air cleaner is not permitted.
Any transmission may be used provided it is listed and delivered by the manufacturer in that vehicle. DIFFERENTIALS Front and rear differential must remain stock as delivered from the manufacturer with the exception of gear ratios and carriers. Four-wheel drive must be able to move under its own power with rear drive line removed. Materials may be added for strengthening purposes only. No knock-off hubs are allowed.
SUPERCHARGERS & TURBOCHARGERS
This class restricted to normally aspirated.
Dash must remain stock except for removal of items that may come off during competition, i.e. ashtray, glove box etc. Replacements must be fabricated to original Pro Truck specifications. Aftermarket gauges are allowed in any location. Air conditioning and heating units may be removed. Upholstered panels, headliners, visors, carpeting and rear seats may be removed.
DOORS & LATCHES
Doors must remain stock as delivered from the manufacturer and operate on stock hinges. Secondary door latches are required.
WEIGHT-Vehicle must weigh the stock delivered weight minimum.
All fenders must remain stock as delivered by the manufacturer. Wheel openings in fenders may be enlarged for tire clearance by a maximum of 2”. Front inner fender panels can be modified to a minimum to allow for front-shock installation. Aftermarket fender flares are allowed.
KOH UNLIMITED CLASS / 4400
Any and all engines are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all transfer-cases are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all driveshafts are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all axle assemblies are permitted, providing they meet all the additional rules and
regulations specified herein.
Any and all steering components and configurations are permitted, providing they meet all the additional rules and regulations specified herein. Rear steering is permitted.
Any and all suspension components and configurations are permitted, providing they meet
all the additional rules and regulations specified herein.
Shock absorbers of any make/model/type are permitted and may be installed in any location and orientation, providing they meet all the additional rules and regulations specified herein.
Manual suspension controls (e.g. forced hydraulics) are permitted.
WHEELS & TIRES
Any and all tires are permitted, providing they meet all the additional rules and regulations specified herein