1973-1987 Squarebody GM Truck TREMEC TKX, Magnum, & A41 4L60E Transmission Kits

Upgrade the driveability and efficiency of your 1973-1987 Chevrolet or GMC C-Series "Squarebody" truck with our PerfectFit™ Transmission Kits. Specifically engineered for this iconic generation of C10 and C20 pickups, we offer the industry’s premier overdrive solutions. Choose from the streamlined TKX 5-Speed, the high-torque Magnum 6-Speed, or our smooth-shifting A41 4L60E Electronic Automatic.
 

These kits are designed to provide a seamless fit into your 1973-1987 chassis, delivering significantly reduced cruising RPMs and improved fuel economy while maintaining your factory bench seat or bucket seat interior. Each system arrives as a total solution, featuring all the high-quality components required for a professional installation that eliminates the "granny gear" feel and brings modern, precision shifting to your classic GM pickup.