The main automatic transmission to use a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released for that 1948 model year. In regular driving, the Dynaflow applied only the prime equipment, relying on the torque multiplication with the torque convertor at lower speeds. The https://gearbox-auto55319.angelinsblog.com/32961155/the-definitive-guide-to-gearbox-auto