The first automatic transmission to work with a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was released to the 1948 model 12 months. In typical driving, the Dynaflow utilized only the top equipment, counting on the torque multiplication in the torque convertor at lower speeds. https://gearbox-auto72838.mpeblog.com/59817371/detailed-notes-on-gearbox-auto