Tractor is designed for the 7,000 lb. open pulling class, could change to a heavier class with different gears, 4430 head ported, bigger injector lines and pump, the pump is set to zero degrees, rest of tractor is stock, recommend to run the fuel shut off at half to not rev. out the engine until you are ready to pull, operates as it should per the seller. Located in Denmark, WI., for questions, viewing, and pick up contact Mike at 920-370-5344.