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Diesel Truck 2.6

 

All trucks must meet safety requirements specified on the General Truck Rules Page

The Street Diesel (SD) class is designed for streetable pickup trucks with a wide variety of

performance upgrades. Valid DOT registration and license plates are mandatory. The vehicle may

be two or four-wheel drive.

Designations: 2.6 SD

Weight: 8000 lbs. Maximum, with driver.

REGULATIONS:

Ballast: Ballast is permitted. Hanging weights may not extend more than 60 inches from the

centerline of the front axle.

Batteries: The batteries must be securely mounted. They may not be located in the driver

compartment or forward of the radiator core support.

Body: The body must be an OEM truck body, including the full bed floor. The body must retain

full 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

Brakes: Four-wheel 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 in the vicinity of the stock location and be of at least stock

size.

Credentials: All drivers must have a valid state drivers license.

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 worn.

Driveshaft Loops: All trucks must have at least six inch wide u-joint shields around the rear ujoint

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. All shields must be securely mounted to the vehicle. Any front shaft

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.

Engine: The engine block must have been available as a factory option on a one-ton or smaller

pickup truck. Blocks must circulate coolant freely. Water pumps must be present, but may be

powered electrically. The use of concrete or other block fillers is prohibited. All factory beltdriven

accessories, excluding the air conditioning compressor, must be retained and powered via

the crankshaft by a standard serpentine or ‘V’ belt. Electric fans are permitted. Aftermarket

radiator assemblies are permitted, but must be securely mounted in the same general area as the

OEM unit. NITROUS OXIDE is prohibited along with other oxygen extenders and the use

of PROPANE is also prohibited. All system components MUST be removed from the truck.

Exhaust: All vehicles must be equipped to direct exhaust upward. The exhaust must exit

rearward of the driver’s compartment. Stacks exiting through the hood or fender-well

are prohibited. Two 3/8 inch diameter bolts must be installed through the exhaust pipe in a cross

pattern within one inch of each other as close to the turbo as is practical.

Fire Extinguisher System: A fire extinguisher system is permitted. It must be securely mounted.

Fuel: The fuel must be pump #1/#2 diesel only. Soy/Bio-diesel fuel is permitted. Off-road diesel

fuel is prohibited.

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.

The P7100 injection pump, if equipped, must utilize a stock-appearing governor.

Harmonic Balancer: All engines turning 4500 RPM and higher must be equipped with a

harmonic balancer or damper meeting SFI Spec 18.1. A shield across the frame under the

front of the motor shielding the damper and engine fan area is required.

Hitch: The hitch must be a receiver-style hitch; reinforcements are permitted. Reinforcements

must not extend forward of the centerline of the rear axle. 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. 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 on 4wd units and 30 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 center of the clevis loop.

Interior: A complete interior, including dashboard, door panels, headliner, etc., is mandatory.

Two matching front seats are mandatory. Aftermarket seats are permitted; they must be fully

upholstered. All factory controls (lights, signals, horn, windows,

wipers, etc.) must be retained and be operative. The use of hand-throttle controls are

prohibited.

Rear End: Non-OEM rear-end housings are prohibited. The rear end must have been an option

on a one-ton or smaller pick up. Rear axle bolts must 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. Non-OEM power assist methods are prohibited.

Street Equipment: Complete headlight and taillight assemblies (all) are mandatory and must be

operative. 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.

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. The final decision rests with the NADM Technical Department.

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 may be bolted solid to eliminate travel. All rear suspensions must use at

least one working shock absorber per wheel.

Tires: The tires must be DOT street tires. Cut tires are prohibited.

Tow Vehicles: Tow vehicles are prohibited.

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 torque

converters, valve bodies and internal components are permitted. Transmission brakes

are prohibited. 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. A functional neutral safety switch is mandatory. All

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

engines running 4500 RPM or more and 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; it must be appropriately labeled as meeting SFI Spec 4.1

and it must extend from the rear of the block to the front of tail housing with a minimum six-inch

overlap where it is fastened. All non-blanket-type

shields must incorporate two (or one, per manufacturer’s instructions) 3/4 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. All vehicles with engines running 4500 RPM or more

and using an automatic transmission must be equipped with a flex plate meeting SFI Spec

29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.

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.

Turbocharger: The vehicle is limited to a single turbocharger; the inducer bore on the

compressor housing may be 2.6”. The inlet will be measured using a 2.65-inch plug or internal

calipers. Bushing from any larger turbo size down to a 2.6 turbo is PROHIBITED. A stock

map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that has a

width greater than 1/4 inch. All provisions allowing air to the wheel other than via the bore and

the MWE groove are prohibited. 6.4 liter Powerstroke engines may utilize the factory twin-turbo

configuration.

Water Injection: Water injection is prohibited. All system components must be removed from

the truck.

Wheelbase: The vehicle must retain the original unaltered factory wheelbase and track width.

Front dual-wheel spacers may be used only with accompanying positive-offset dually style

wheels. Maximum width is 102”.

Rule difference - MMTTPA REQUIRES KILL SWITCH FOR THE 2.6 DIESEL TRUCKS