Gears are for noise ( they sound like superchargers whine ). Pete jackson makes a good gear drive, proform has one that is $93.00 if you cheap out. If you have a supercharger you dont need the gear drive. The most common and efficent way to time your cam is with a roller chain. Cloyes is a good company for them and they sell them in summit and jegs, these do wear out where as gear drives don't. when they wear out you just replace the chain. There are other company's that make roller chains but cloyes holds up for a $25.00 timing chain set. In gear drives, they are not as efficiant as roller chain but they all have about the same noise unless you get one that is " silent " these do not make noise.