The most important performance components of power pulling tractors are, in descending order, engine, drivetrain, chassis and tires. Low-end torque from the engine and traction from tires are essential for getting heavy pulling sleds moving and, as torque and horsepower increase, stronger transmission, differential and frame components are needed to handle the power.Continue Reading
For National Tractor Pullers Association (NTPA) Championship Pulling events, there are several different classes in which tractors can be categorized based on the level of modification, engine size and overall weight. All competition-level pulling tractors employ multiple engines, some of them modified automotive engines and some of them fabricated specially for the sport. The average power pulling tractor makes 2500-2800 horsepower to its wheels and the most powerful tractors can make over 10,000 horsepower.
Since the drivetrain and chassis components needed for that much power must be thick, dense and heavy, classes of power pulling tractors are determined primarily by weight. All NTPA classes except Light Unlimited utilize forced induction - superchargers for the lower weight Modified Tractor classes and turbocharger for the larger Super Stock and Pro Stock classes. Since there are limits on weight, engine number and size, turbocharger/supercharger number and size, and tire size, and all tractor teams aim to meet those limits precisely, the most successful pulling tractor teams are the ones that are able to engineer the most power and reliability within the given framework of their weight class.Learn more about Tools