The Muncie four-speed gearbox has been one of - if not the most - popular transmissions among drag racers, road racers, and street rodders since its inception in the latter part of the 1963 model year. It was at this time that General Motors decided to develop in-house a brand new four-speed to eliminate dependency on the venerable Borg-Warner T-10. The Borg-Warner was a stout, side-loaded transmission with side-lever shift linkage that had been derived from the Warner T85 three speed. It had served many General Motors divisions well since 1957 but GM decided to make the change for the better, especially since newer, more powerful engines were on the way.