GM Classic & Muscle Car TKX, Magnum, & A41 4L60E Transmission Kits

Bring modern performance and highway driveability to your classic GM vehicle with our PerfectFit™ Transmission Kits. We offer the most comprehensive overdrive solutions for Chevrolet, Pontiac, Oldsmobile, and Buick, featuring the streamlined TREMEC TKX 5-Speed, the high-torque Magnum 6-Speed, and our A41 4L60E Electronic Overdrive Automatic. These kits are precision-engineered to fit your specific GM chassis, providing either crisp manual shifting or smooth, modern automatic performance. Each system is a total solution, arriving with all the high-quality components necessary to ensure a professional installation and a rejuvenated driving experience for your GM muscle car or classic truck.