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Class Descriptions
The Two Wheel Drive (TWD) class uses truck
bodies as well as T-bucket and funny car bodies possessing single, supercharged
racing engines. These vehicles are known for their high wheel standing passes.
Their big block V-8 power will pierce the air as they make their way down the
clay track in search for full a pull.
The Mini Modified Tractors (MINI) are known as
the “Wildest Ride on Four Wheels” and rightly so. With a horsepower ratio of one
horsepower per pound and a wheelbase of less than 100 inches, these machines are
one tough ride to wrangle. Minis have the distinction of being the lightest
class in all of the NTPA’s 12 Championship Pulling Divisions weighing in at
2000lbs. Combine these factors and it is amazing the competitors can guide these
mini monsters down the track in a straight line.
The Unlimited Modified (UNL) Tractors are the
kings of the clay track. This division displays a field of tough competitors and
their mechanical marvels. Turbines, multiple supercharged engines and Allison
aircraft motors are the dominant power sources. These machines are capable of
generating gobs of horsepower, anywhere from 9,000 to 12,000 horsepower. The key
to winning is putting that power to the track.
Super Stock Diesel Tractors (SST D) are the
pinnacle of the diesel tractor classes. With up to 4 turbos, 540 cid and awesome
wheel speeds, this class is always a fan favorite. They have their roots as farm
tractors and even have a stock exterior appearance. Underneath the sheet metal
is a different story. These beasts can crank out some major horsepower when
screaming down the track.
The Four Wheel Drive (FWD) and Super Stock Four Wheel
Drive (SSFWD) Truck division
showcases Chevy, Ford, Dodge trucks and more utilizing monster fuel injected engines.
Close competition is noted in these divisions, as many times all competitors are
within just a few feet of each other when the dust settles.
The Super Modified Four Wheel Drive (SMFWD)
trucks are 500 cid, blown racing engines that put the power to the ground via
all four corners. These trucks lay down some spectacular passes while clawing
their way to the 300 foot mark. There is definitely a variety of makes, models
and motors in this division.
The Super Stock Four Wheel Drive (SSFWD)
trucks are ....
The Diesel Pro Stock Four Wheel Drives
are diesel only trucks weighing in at a maximum of 8000lbs. With a variety
of (required) full size OEM body styles these beast are powered by up to a 460
cubic inch single turbo engine.
Super Semis are the heavyweights of tractor
pulling. These giants are fan favorites wherever they go and overshadow other
competition vehicles. They live up to the title of “Heaviest Motorsport on
Earth” in so many ways. The Super Semis weigh in at 20,000 lbs. and pull monster
loads stacked on the sleds as they charge down the clay track. If you want to
see brute force at its best then don’t miss these beasts battle for precious
points and the bragging rights from a victory at any NTPA event. These are super
competitive trucks with several drivers capable of a win on any given night.
Heavy Super Stock Tractors (HVY SST) and Light Super Stock
(LGT SST) Tractors are powerful, agricultural type machines which
appear in the heartlands of America, but looks can be deceiving! These John
Deere, Case IH, Ford, and Allis Chalmers’ brand tractors create tremendous
horsepower and wheelspeeds. Diesel or methanol alcohol fuel powers these
machines, which can utilize up to four turbochargers on a stock block. The
primary difference between the classes is the amount of cubic inch displacement
and weight.
Competitors in the Modified (MOD) division
utilize various powerplant arrangements, such as multiple supercharged engines,
twin V-12 Allison aircraft engines, and even jet turbines, developing
approximately 5,000 horsepower at 100 M.P.H. wheel speeds. These multi-engine
monsters are sure to please those hungry for horsepower.
Super Farm Tractors (SFT) are closest to “off
the farm” workhorses as you will find in NTPA competition. Engine size is
limited to 640 cubic inches, they must use the OEM manifold and heads for that
brand engine and can only use one three inch turbo. Diesel fuel is still the
only permitted fuel and tire sizes are also the same as Pro Stock Tractors. The
fuel pump is limited to a “P” type pump and competitors must use the stock
intake and exhaust manifold for that brand engine. The Super Farm class is
extremely competitive and any competitor has a shot at winning.
Pro Stock tractors are limited to one
turbocharger and diesel fuel is the only allowable source for powering these
machines. John Deere and IH are the dominant brands, but oftentimes another
brand or two is found mixing up the “green“ and “red“ parade. The
agricultural-based fans will see a slight similarity in the appearance of these
tractors in relationship to what they see at home in the field, but the power
and paintjobs on these machines are just two of the differences that will jump
out.
Limited Pro Stock tractors
are quite similar to the Pro Stocks but are limited to engines under 640ci and a
turbo limited to a 4.5 outlet. There may be limitations to these toys but
they'll put on quite an exciting show.
Light Pro Stock are
limited to 540 cid and can use any turbo they choose. They sport the OEM
body and can put on a magnificent show. This class burns diesel only and
can really haul down the track.
Classes, rules and regulations are subject to NTPA guidelines.
Refer to the NTPA for up to date info.
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