Upgrading to a 5 Speed TKX Transmission Packages are a game-changer for classic car enthusiasts and performance seekers looking for improved drivability and efficiency. The TKX 5-speed transmission, developed by Tremec, is designed to handle high torque while delivering smooth, precise shifts. Whether you’re restoring a vintage muscle car or upgrading a classic truck, the 5-Speed TKX Transmission Package provides a perfect balance of modern performance and reliability. Unlike older four-speed gearboxes, the TKX allows for better highway cruising with reduced RPMs, improving fuel efficiency an