A new performance differential ring and pinion will give your C5 or C6 Corvette quickness that you really can feel in the seat of your pants. Matched gear sets eliminate the possibility of "rear-end whining". Designed to fit all 1997-2004 and 2005-2013 non-Z06 or Grand Sport Corvettes. For use with factory 3-series carrier only (3.15 and up gear ratio).