DIESEL 4 X 4 TRUCKS
is Diesel only fuel class is designed for pickup trucks with a wide variety of
performance upgrades that may be driven or hauled to the pull
Credentials: Valid DOT registration and license plates are
mandatory. The vehicle may be two or four-wheel drive. Pulling vehicles may be
held for post competition tech inspection. Failure to abide may result in a DQ
Weight: 8500 lbs. Maximum, with driver.
Ballast: Ballast is permitted. Hanging weights may not
extend more than 60 inches from the centerline of the front axle. Weight boxes
are prohibited. Final decisions rest with the technical department. Weights and
brackets must be removable by hand. No Ballast/added weight in the cab area.
Batteries: The batteries must be securely mounted. They may
not be located in the driver compartment or forward of the radiator core
Body: The body must be an OEM truck body, including the
full bed floor. The body and truck bed must retain full factory sheet metal.
Metal aftermarket hoods are permitted. Fiberglass is prohibited. The hood must
be closed and securely latched while the vehicle is hooked to the sled. The
complete OEM firewall and complete OEM floor pan is mandatory. Front bumpers are
mandatory; Ranch hand style and others are permitted. Rear Bumpers mandatory;
Rear roll pans are allowed.
Brakes: Four-wheel fully operational O.E.M. hydraulic
brakes are mandatory.
Chassis: 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.
Cooling System: Radiators must be functioning and in the vicinity
of the stock location and be of at least stock size.
Credentials: All drivers must have a valid state driver’s
Driveline: An OEM transmission and transfer case is mandatory.
They must have been an option on a one-ton or smaller pickup.
Driver Restraint System: The OEM restraint system is mandatory and must be
Driveshaft Loops: All trucks running for points must have a minimum
of 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
end of the rear shaft.
Engine: The engine block must have been available as a
factory option on a one-ton or smaller pickup truck. Block and Head must
circulate coolant freely. No hard filled blocks/heads. Water pumps may be
factory or electric powered. All factory belt driven accessories, excluding the
air conditioning compressor, must be retained and powered via the crankshaft by
a standard serpentine “V” belt. Electric cooling fans are permitted.
Aftermarket radiator assemblies are permitted, but must be securely mounted in
the same area as the OEM unit. ** A sled- and driver- operated spring loaded
emergency air shut off is mandatory for all vehicles running for points and/or
any vehicle running over Factory O.E.M. Specs. The cable must terminate into a
two inch diameter steel ring.
NITROUS OXIDE is prohibited
along with other oxygen extenders and the use
of PROPANE is also prohibited. All system components MUST be removed.
Exhaust: All vehicles must be equipped to exit exhaust
rearward of the driver’s compartment. Stacks exiting through the fender well
and hood are prohibited. Two (2) 3/8 inch diameter bolts must be installed
through exhaust pipe in a cross pattern within one (1) inch of each other and as
close to the turbo as possible.
Fire Extinguisher: A fire extinguisher (minimum 2.5 pound dry-powder
type) is required and must be in working order with gauge fully charged. Fire
extinguisher must be within reach of the driver.
Fire Extinguisher System: A properly installed fire extinguisher system is
Fuel: The fuel must be pump #1/#2 diesel only.
Soy/Bio-diesel fuel is permitted. Off-road diesel fuel is prohibited. Fuel tank
must be in O.E.M location or an approved racing type fuel cell mounted properly
in the bed.
Fuel Injection Pump: The fuel injection pump is limited to a
stock-appearing, OEM engine make-specific pump only. Dual high-pressure
common-rail fuel pumps or HPOPs are permitted.
Harmonic Balancer: All engines turning 4500 RPM and higher must be
equipped with a
harmonic balancer or damper
meeting SFI Spec 18.1.
Hitch: The hitch must be a receiver-style hitch;
reinforcements are permitted. Any hitch attachments /bracing must be
from frame down not from axle up. Reinforcements must not extend forward of the
centerline of the rear axle. Reinforcing materials will all be below the plane
of the frame rails. Trick hitches are prohibited. The hooking
point must be the rear-most point on the vehicle and must be rearward of the
stock location of the tailgate. Hitch must be a minimum of 44” measured form
the centerline of the rear axle to the hooking point. The hitch must be
horizontal to the ground and stationary in all directions. Bumpers may be
notched or removed. The hitch’s height from the ground may not exceed 26
inches and be adjustable to 24”on 4wd units and 30” and be adjustable to
28” inches on 2wd units. The hooking point must have a minimum 3.750-inch
inside diameter opening for the sled hook. The hooking point will be measured to
the rear of the opening in the clevis/hook loop.Hooking point (i.e. where the
hook drops) must be parallel to the ground. Final decision of legality of all
hitches resides with the head tech official.
Intercoolers: Factory style or aftermarket air to air
replacement only in stock location. **Water to air coolers are prohibited.** Any
means of cooling the air before the engine, except the air to air cooler is
prohibited. **NO USE OF ICE OR WATER OR COOLED GAS/VAPOR**
Interior: A complete interior, including dashboard, door
panels, headliner, etc., is mandatory. Two matching OEM front seats are
mandatory. Must have full back and head rests on seats. All factory controls
(lights, signals, horn, windows, wipers, etc.) must be retained and operative.
Rear End: Non-OEM rear-end housings are prohibited. The rear
end must have been an option on a 1-ton or smaller truck. Rear axle bolts to be
covered by a cap or shield.
Steering: The vehicle must retain the full, original OEM
steering gear. The vehicle must retain the original OEM power steering
assistance, if it was so equipped. Additional stabilizers are permitted.
Street Equipment: Complete headlight and taillight assemblies (all)
are mandatory and must be operative in OEM locations. Complete OEM windshield
and windows are mandatory. Windows must be operative per factory specifications;
that is, they must open and close via OEM electrical or mechanical means.
Driver’s window must be completely rolled up while competing. Other windows on
truck may be lowered.
Suspension, Front: The factory suspension configuration must be
retained. The upper mounting point for strut assemblies must be in the factory
location. Adjustable caster/camber pillow ball mounts are permitted. The lower
control arm may be strengthened provided factory-mounting points to chassis are
maintained. The lower mounting point for the strut assembly may be modified for
improved caster or camber. Strut tower braces, lower tie bars, sway bars, and
limit straps are permitted. Traction bars and devices are permitted.
Suspension, Rear: An OEM-style suspension is mandatory. Traction bars
and devices are permitted; they must be bolt on only; welds are permitted for
attachment to frame or axle housing. Control arms may be strengthened or
replaced, provided all original mounting points are retained. Strut tower
braces, lower tie bars, sway bars, limit straps, and camber kits are permitted.
The rear suspension must allow 2” inches of downward compression/travel,
compression stops must be adjustable. All rear suspensions must use at least one
working shock absorber and leaf spring per wheel. Airbag spring assistance is
permitted; airbag compressors must be disconnected. A truck may run a solid
suspension using removable blocks with a 24” hitch height.
Tires: The tires must be DOT street tires. Cut tires are
prohibited. Use of dirt deflectors is prohibited. Rear Dual Tires permitted with
OEM appropriate bed. Flatbeds with or without rear duals may be permitted with
prior USA-Tech Committee approval. Max ground contact patch of 18” Per Side
for Trucks running dual wheels. Use of dirt deflectors is prohibited.
Throttle: OEM style foot throttle only with two springs on
the fuel injection pump. No Hand Throttles.
Transfer Case: Non-OEM transfer cases are prohibited. It must have
been an option on a one-ton or smaller pick-up truck.
Transmission, Automatic: Non-OEM transmissions are prohibited. Aftermarket
Transmission, Manual: Non-OEM transmissions are prohibited. Aftermarket
internal components are permitted. A clutch meeting minimum SFI Spec 1.1 or 1.2
is mandatory on all vehicles with engines running 4500 RPM or more. All manual
transmissions must be clutch assisted. Sequential shifters are prohibited. All
vehicles with engines running 4500 RPM or more and equipped with a manual
transmission 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.
The vehicle is limited to a
single turbo with a compressor inducer of 2.5″ as specified below.
Competitors must make provisions at tech officials’ request to allow complete
inspection of the compressor wheel and housing. Failure to comply with the
request will result in disqualification and banishment until the turbo is
** 6.4 liter Powerstroke
engines may utilize the factory twin-turbo configuration with no
alterations/modifications to bore/housing or wheel. 6.4 Powerstrokes will be
permitted to run modified turbos, as long as the atmosphere turbo does not
exceed the OEM straight bore dimension. (2.59”) No TAPERED COVERS will be
Turbo Specs: A single turbocharger with a single compression
stage is permitted. The intent of this rule is to limit turbochargers to
OEM-style wheel and cover geometries with minimal modifications. Owners are
required to make the compressor wheel and cover accessible to FPP techs for
inspection at any time.
**All interpretation of
these rules lie with the SCTPA Tech Officials and their decision is final.
Water Injection: Water injection is prohibited. All system components must be removed from the truck.