1984-1988 C4 Corvette Doug Nash 4+3 to TREMEC TKX Conversion Kit

Modernize your 1984-1988 C4 Corvette by replacing the problematic factory Doug Nash 4+3 transmission with our PerfectFit™ TREMEC TKX Conversion Kit. Specifically engineered to swap out the unique early C4 manual gearbox, we offer the industry’s most reliable 5-speed overdrive solution. The streamlined TKX 5-Speed provides a crisp, modern shift feel and high-torque capacity while fitting within the C4's distinct chassis and tunnel.
 

Our PerfectFit™ kit is designed for a seamless installation into your 1984-1988 Corvette, delivering significantly reduced cruising RPMs and a transformed driving experience while preserving your iconic digital-era interior. This system arrives as a total solution, featuring all the high-quality components required for a professional, high-performance upgrade that finally eliminates the complexity of the 4+3 overdrive unit.