1971-1974 Mopar B-Body TREMEC TKX, Magnum, & A41 4L60E Transmission Kits

Enhance the driveability and modern performance of your 1971-1974 Dodge or Plymouth B-Body with our PerfectFit™ Transmission Kits. Covering the later-generation Charger, Road Runner, and Satellite, we provide the industry’s most robust overdrive solutions. Whether you’re looking to replace a factory 3-speed or 4-speed with the crisp-shifting TKX 5-Speed, handle high-torque big blocks with the Magnum 6-Speed, or upgrade to our precision A41 4L60E Electronic Automatic, we have the total solution.

Our 1971-1974 kits are specifically engineered to integrate with the unique fuselage-era chassis, delivering a massive leap in torque capacity and shift quality while significantly reducing highway cruising RPMs. These systems are designed to fit your interior seamlessly, preserving the factory look of your console or bench seat. Each kit arrives as a complete, bolt-in solution, providing the modern reliability and efficiency your classic Mopar deserves.