Designed and appropriate usage with stock machines to reduce rotating mass, reduce fat, and to enhance power transfer from engine without power loss. Using the Slipper Eliminator, engine performance is relocated directly to the car, and there's additionally no reliance on clutch & slipper modification. Working the spur gear is very actually quick & effortless. Slipper Eliminator is an instantaneous replacement the slipper clutch set. Appropriate LCG gearboxes. Fits just and fast top shaft 324116. Set includes aluminum spur gear hub, and 72T spur gear (an optional 69T spur gear is had).