Mopar E-Body TREMEC TKX, Magnum, & A41 4L60E Transmission Kits

Modernize the legendary performance of your 1970-1974 Dodge Challenger or Plymouth Barracuda with our PerfectFit™ Transmission Kits. The E-Body is the pinnacle of Mopar style, but factory 3-speed and 4-speed gearboxes often leave these high-performance machines screaming at modern highway speeds. We offer the industry’s most refined overdrive solutions: the streamlined TKX 5-Speed, the high-torque Magnum 6-Speed, and our precision-controlled A41 4L60E Electronic Automatic.

Specifically engineered for the E-Body platform, our kits provide a seamless fit into your classic interior, significantly reducing cruising RPMs and improving fuel economy without requiring major structural modifications. Our systems are designed to maintain your factory shifter location—fully compatible with iconic Pistol Grip handles—ensuring your interior looks original while delivering world-class drivetrain reliability. Transform your "Cuda" or Challenger into a high-performance cruiser that handles modern roads with ease.