Modern Overdrive Transmissions for Muscle Cars & Customs

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American PowerTrain - Transmission Kits

GM - Transmission Kits
The ProFit™ Systems are the easiest and most economical way to put a high strength, modern overdrive Tremec TKO 5-speed transmission or T56 6-speed transmission in your car. Our Custom Engineered ProShift™ Tailhousings and Shift Mechanisms provide the smoothest operation, the shortest throws and the only true internal offset in the business. Enjoy a ProFit transmission with low RPM cruising, and great fuel economy today. Check out the video to learn more about the Pro-Fit and Basic Fit Kits

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GM - Transmission Kits - 1956-62 Corvette
GM - Transmission Kits - 1958-64 B-body
GM - Transmission Kits - 1962-67 X-body
GM - Transmission Kits - 1963-67 Corvette
GM - Transmission Kits - 1963-72 C10 Truck
GM - Transmission Kits - 1964-67 A-body
GM - Transmission Kits - 1965-72 B-body
GM - Transmission Kits - 1968-72 A-body
GM - Transmission Kits - 1968-72 BOP A-body
GM - Transmission Kits - 1968-72 X-body
GM - Transmission Kits - 1968-76 Corvette
GM - Transmission Kits - 1977-79 Corvette
GM - Transmission Kits - 1978-83 A-body
GM - Transmission Kits - 1980-82 Corvette
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GM - Transmission Kits - Basic Install kit