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	ProFit™ Transmission Systems for 1984-1988 Corvette (C4) The ProFit™ Systems The easiest and most complete way to put a high strength modern overdrive TREMEC TKO 5-speed in your car. Our custom engineered ProShift Tailhousings and Custom White Lightning shifter mechanisms provide the most accurate OE shift positions, the shortest throws and the best fit for your muscle, sports, rod or race car. ProFit systems include everything you need to make installation a snap with no runs to the local parts store. Buy a system, install it on Saturday, drive it on Sunday. That’s the American Powertrain way!       5 Speeds ProFit™ 5-Speed System This kit is perfect for upgrading your Corvette 4-speed manual transmission to a 5-speed overdrive.   5 Speeds ProFit™ 5-Speed System for Automatics Please Call! (931) 646-4836 This kit is perfect for upgrading your Corvette automatic transmission to a 5-speed overdrive.
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