The first automatic transmission to utilize a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released to the 1948 design 12 months. In standard driving, the Dynaflow utilised only the top equipment, counting on the torque multiplication from the torque convertor at decreased speeds. https://shaneisxza.izrablog.com/34648014/gearbox-auto-for-dummies