The very first automatic transmission to implement a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released with the 1948 design year. In normal driving, the Dynaflow used just the leading equipment, counting on the torque multiplication in the torque convertor at reduced speeds. https://gearbox-auto14681.tusblogos.com/34036936/little-known-facts-about-gearbox-auto