Swapping a TREMEC TKX 5-speed transmission in place of an original Ford Toploader 4-speed is an easy process that transforms the way a classic car drives and feels. For this article, we photographed the transmission upgrade on a 1966 Mustang, which is a great example of how the compact TKX was designed for easy fitment in early Pony cars and muscle cars. The Ford Toploader was one of the best factory 4-speeds you could get during the muscle car era. But it is easy to see how the overdrive, increased torque capacity and improved shift feel in the modern TREMEC TKX 5-speed is a great upgrade. Read More “Swapping a TREMEC TKX 5-speed Transmission in Place of a Toploader 4-speed in a 1966 Ford Mustang”