The Keisler PerfectFit™ System is the easiest and most complete way to put a high strength, modern overdrive Tremec TKO 5-speed transmission in your Corvette. Keisler Custom Engineered PerfectShift™ Tailhousings and Shift Mechanisms provide the smoothest operation, the shortest throws and the only true internal offset in the business. Enjoy a PerfectFit 5-speed transmission with low RPM cruising, and great fuel economy today. See our website for more information.