American Powertrain Announces New Pro-Fit 5 & 6-Speed System for 1978 – 1987 GM G Body Vehicles

American Powertrain Announces New Pro-Fit 5 & 6-Speed System for 1978 – 1987 GM G Body Vehicles

System includes TREMEC® transmission with choice of gear ratios

Cookeville, TN (August 27, 2019) – American Powertrain, the world’s largest TREMEC dealer, is now introducing the next generation Pro-Fit 5-speed & 6-speed system for 1978-1988 GM G Body.

Designed around the famous TREMEC® TKO 5-speed and the dual overdrive Magnum 6-speed transmissions, the Pro-Fit kits features a custom adjustable cross member, custom high strength driveshaft, trans mount, offset shifter and speedo solution. G-body hydraulic clutch kit is also available to complete the conversion to three pedals.

American Powertrain has all the parts and pieces of the Pro-Fit kits available separate so you can build out your kit to fit the needs of the project. A full assortment of bell housings, clutches, flywheels and driveline parts are available from American Powertrain.

All Pro-Fit kits are covered by American Powertrain’s two-year warranty and includes extended hours tech support.

For more information visit To speak with one of American Powertrain’s highly qualified sales technicians, call 931-646-4836.


American Powertrain exists to help muscle car owners equip their cars with modern drivetrain technology, offering overdrive transmission systems, hydraulic clutch kits and a wide range of drivetrain related parts from diff to block. Since American Powertrain opened for business, we have quickly become the world’s largest TREMEC dealer. Our installation parts and systems are proudly made right here in America for unmatched quality. Our staff of highly experienced enthusiasts has years of experience helping car owners and builders make the right drivetrain choices