Dynaflow

Dynaflow was the trademarked name for a type of automatic transmission developed and built by General Motors Buick Motor Division from late 1947 to mid-1963. The Dynaflow, which was introduced for the 1948 model year only as an option on Roadmaster models, was based on similar principles as those applied for the Torqmatic transmission used in the M18 Hellcat tank destroyer (built in Buick's Flint Assembly plant) and M26 Pershing tank during World War II, namely a multi-element torque converter and manually selected intermediate gears. It was also used in the 1951 Le Sabre concept car.