Two Wheel Drive Truck Rules - Red River Valley Pullers Association

Two Wheel Drive Truck Rules
General Information
1. One vehicle will be allowed to pull only once per class. (Two individuals cannot run the
same vehicle in a single class.)
2. Any major infraction will cause loss of eligibility for a year and 10 days.
3. Engine and/or drive train protest will be $100 protest fee, if engine and/or drive train are
found to be illegal, fee will be refunded. If engine and/or drive train are found to the
legal, protest fee will be given to the owner of the vehicle protested.
4. Weight protest fee will be $25.
5. Driver must wear helmet and fire suit. RRVPA recommends each driver to wear a neck
brace. A fire extinguisher must be on board and easily accessible by driver. Contestant
must be a minimum of sixteen years of age and have a valid driver’s license.
6. No stock pickup may pull in any modified class.
7. Alcohol fueled units must have a yellow “A” sticker on windshield. RRVPA will
provide stickers for all units, member or not.
2WD Trucks
1. Vehicles in this division will adhere to all pertinent criteria of modified tractor safety,
construction and operation, unless special variations are noted.
2. Weight class 6200lb
3. Body/Chassis
a. The maximum length of the vehicle is no more then 15 feet from centerline of rear
axle to forward most portion of the vehicle weight racks.
b. The 15-foot from center of rear axle overall rule will apply to all TWD vehicles
with the exception of a 10-inch over-length allowance for cosmetic fiberglass
only. No steel structure, re-enforcement or steel bumpers allowed past 15 feet.
Tow hook to be consistent with 15-foot rule.
c. NOTE: This allowance applies only to pickup truck style bodies of the following
i. 1994 or newer Dodge
ii. 1996 or newer Ford
iii. 1998 or newer Chevy/GMC
d. Must run a minimum of 14 inch rims with an automotive or front tractor tire.
e. Any Wheelbase is permitted.
f. Front wheel and axle to remain in the visual center of the front wheel well.
Maintain minimum of 2 inches of complete original type wheelhouse forward
front of wheel. Must be able to see forward most part and rearward most part of
tire from a side view.
g. Maximum width of vehicle 8 feet.
h. Weights are not extended forward of maximum length state in Rule 3a above, nor
rearward more then 12 inches from hitch point and must not interfere with
hitching and unhitching of vehicle.
i. Any factory production body truck or car is allowed, including passenger type
j. Funny car-type body and/or fiberglass body must have escape hatch or doors in
top of back of body.
k. Vehicle must have a presentable van/pickup bed with cover or flatbed in place.
l. Chassis (frame) may be truck frame or fabrication similar to modified tractors.
m. Vehicle must have hood, grill, and fenders in place as intended by manufacturer.
n. Vehicle body style must be or have been available form a dealer as mass
o. Vehicle must maintain original appearance.
4. Vehicle appearance:
a. Fiberglass hood scoops, spoilers, fender flares are allowed.
b. Allowed to use stock appearing pickup truck and van fiberglass bodies and body
c. Driver must be in original driver compartment.
d. Side doors must be mounted and closed if vehicle was manufactured with doors.
e. Vehicle doors must have a single hatch design, allowing the door to open from
both inside and outside.
f. Flip-top-body type vehicles that do not have two working doors must have door
glass lowered or removed while under green flag.
g. Vehicles with less than stock size window opening must have an escape hatch
with a minimum size of 17-inches x18-inches, or large enough for driver to exit.
NOTE: Escape hatch will not be counted as a working door.
h. All TWD vehicles must have a presentable front windshield of glass, plexiglass
(acrylic), or lexan (polycarbonate). Factory-tinted glass is acceptable. Stained or
smoked glass not allowed. Tinted windows that impair track official’s view of
drivers compartment not allowed.
i. Vehicle in this division must have vertical bumpers at the rearmost point of the
vehicle. Bottom bumper to be a minimum of 24 inches from the ground. Bumper
to extend minimum of 8 inches vertically. Must be rigid.
5. Driveline/Clutch
a. Note: Engine to clutch to transmission to be constructed as Modified tractor:
b. Torque converters, automatic shifts, etc. are permitted.
c. No electronic, pneumatic or hydraulic device that affects the clutch system,
allowed. All staged or variable released clutches of any description prohibited.
(This does not affect slave cylinder for clutch pedal.)
6. Driveline shielding
a. Without planetary rear end. If planetary rear end is not used, transmission to final
drive must be like FWD trucks.
b. Vehicle must have three round metal loops shielding on each drive shaft. (twopiece drive shaft must have six metal loops.)
c. 360 degree loop must be a minimum of 3/8-inch aluminum or 5/16-inch steel, 3/4
wide (or wider) and not more than 2 inches from the shaft in any direction.
d. Drive shafts between engine and transmission must have solid shielding a
minimum of 3/8-inch aluminum or 5/16-inch steel.
e. Vehicle must have 360 degree metal shield around u-joints, 3/8-inch aluminum or
5/16-inch steel, minimum width 6 inches.
f. Axle and hub bolt shield required, except where planetary final drives are used.
g. Shield must be at least 0.060 inch thick.
h. b. Minimum diameter of axle end or hub bolts to be covered on both front and
rear axles.
i. Mounting shield may not be mounted to axle end or hub bolts.
j. d. A hole may be installed in center of front shield so lock can be operated, so
long as hub end or axle bolts are covered.
k. No counter balancers permitted in drivetrain.
l. With planetary rear end: If planetary rear end is used, transmission to final drive
must use Modified Tractor shielding.
m. All remaining drive train, excluding additional manual transmissions, must be
enclosed in minimum 5/16-inch steel or 3/8-inch aluminum, round, inside
diameter not to exceed 2 inches more than the outside diameter of the largest
universal joint, fastened every 6 inches or closer, with 3/8-inch or larger bolts
(grade #5), or butt and seam welded, and securely mounted to vehicle frame.
Applies to all vehicles with exposed drive shaft. No more than 1/4-inch of end of
driveline shielding in place. Note: if U-joints are used in any drive shaft
application, the shielding must be 5/16-inch steel or 3/8-inch aluminum with 1/8inch steel insert in aluminum. The insert must be a minimum of 6 inches wide.
7. All TWD vehicles engine/automatic transmission combinations must have either of the
a. Two front engine mounts, two rear engine mounts, and a support saddle for rear
transmission, with 1/2-inch maximum transmission.
b. Two front engine mounts, support saddle at rear of engine, with 1/2-inch
clearance, and a mount at rear of transmission.
c. TWD vehicles with a drive shaft of 60 inches or longer must have a minimum 2
inch nylon strap in the middle of that span to secure the drive shaft shield to the
1. Engine/Engine limitations.
a. Vehicles are limited to a single automotive-type engine.
b. Automobile engine is any engine or its replica available in a passenger car.
Maximum 8 cylinders. A replica to be considered legal must accept and swing
a stock crankshaft. No diesel engines permitted.
c. At all levels of TWD competition - a limit of 575 cubic inch and two valves
per cylinder.
d. Engines may be supercharged or turbo-charged or nitrous injected. Nitrous
injection allowed on natural aspirated engines only.
e. SFI blower restraints required on all super charged engines.
f. Engine must be stock location, which is defined at being within engine
compartment as manufactured, behind stock grill and in front of stock firewall.
g. Vehicle may run without radiator, and engine may be moved forward, but
engine must stay behind the grill. “Entire engine” to mean anything that is
bolted to the engine block.
h. Except for high performance type starters with crack shaft drive, rear of engine
block may not be moved forward of center line of front axle.
i. Allow only single staged turbochargers in the division and must therefore follow
safety rules that apply to all turbo-charged engines, which are found in General
j. Competitor must disable one ignition system by means of other than a switch:
i.e. removal of spark plug wires on either end or removal of the distributor for
that system.
k. Fuel injection (and carburetors) and headers may protrude through the hood.
Note: Bubble or scoop is optional, but if used, the scoop or bubble must cover
the carburetor (s) of fuel injection, if induction system protrudes through the
l. Vehicle must have vertical exiting exhaust. Height of pipe must be a minimum
of one foot above the bend. “Vertical” is defined as being plumb, with a 10degree variance in any direction permitted.
m. Vehicle to conform to provisions of Modified tractor engine shielding.
2. Frame
a. Vehicle must have floor or bed cover.
b. Vehicle may compete without tailgate or rear door (s) for greater hook point
c. No portion of vehicle may interfere with sled, chain or hook during pull or
while being hooked or unhooked.
d. An area 5 inches wide and 12 inches high immediately above the drawbar must
be free of all obstructions (including weights, wheelie bars, and second draw
bars) for ease of hooking and unhooking.
e. If body extends more than 12 inches behind point of hook, the open area must
be 18 inches above draw bar and 24 inches wide at rear most point of body.
f. Vehicle must have tow hitch on front of vehicle.
g. It may extend no more than 6 inches ahead of the farthermost front portion of
the vehicle.
h. It will not be counted when measuring length of vehicle.
i. It must have a 3-inch diameter hole, positioned horizontally.
j. It must be strong enough to push or pull the vehicle at its heaviest weight.
k. It is to be used only for pushing or pulling the vehicle.
3. Safety
a. Vehicle must have a complete firewall with no holes except for controls.
Holes not to exceed 1/2-inch larger than control.
b. Vehicles that do not have working doors must carry an onboard fire system
with minimum of three nozzles located within the driver’s compartment/engine
c. Flip-top or funny car type vehicles must have body in lowered position before
vehicle hooking to sled.
d. Flip-top type bodies must have a safety lock to hold up the body.
4. Operators compartment:
a. No radiator, head exchanger and/or water hoses allowed inside operator
b. If battery is inside operator’s compartment, it must be safety enclosed and
security fastened.
c. No fuel tanks, fuel pressure gauges, fuel pumps and/or fuel lines inside
operator’s compartment.
d. If fuel tank is located behind the driver, a fire barrier is required from the
firewall to the rear of the drivers at. (0.6. Inch aluminum or steel is acceptable
fore barrier material.
5. Tires
a. The rear tire diameter shall bot exceed 143” circumference when mounted on
an 18-inch rim and inflated to 28 psi. The ground patch is not to exceed 19
inches on original thread.
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