Designed and recommended for use with stock motors to cut back rotating mass, reduce fat, also to enhance power transfer from motor without energy loss. Using the Slipper Eliminator, engine performance is moved straight to the car, and there's also no dependence on clutch & slipper modification. Exchanging the spur gear is incredibly really quick & effortless. Slipper Eliminator is an immediate replacement the slipper clutch set. Compatible with LCG gearboxes. Fits only and fast top shaft 324116. Set includes aluminum spur gear hub, and 72T spur gear (an optional 69T spur gear can be had).