1968-1974 GM X-Body TREMEC TKX, Magnum, & A41 4L60E Transmission Kits

Unleash the full potential of your 1968-1974 Chevrolet Nova, Pontiac Ventura, Oldsmobile Omega, or Buick Apollo with our PerfectFit™ Transmission Kits. This generation of X-Body is a muscle car icon, yet factory 3-speeds and non-overdrive automatics often leave the engine screaming at highway speeds. We provide the industry’s most robust overdrive solutions: the streamlined TKX 5-Speed, the elite Magnum 6-Speed, and our precision-controlled A41 4L60E Electronic Automatic.

Our 1968-1974 X-Body kits are engineered to integrate seamlessly into your classic interior, maintaining factory console or bench seat fitment while providing a massive leap in strength and shift quality. Whether you are upgrading a daily driver or a high-torque street machine, our systems arrive as a total solution. Each kit includes all the components needed for a professional installation that reduces cruising RPMs and brings modern, high-performance reliability to your classic GM drivetrain.