The first automatic transmission to utilize a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 design year. In typical driving, the Dynaflow applied only the best equipment, depending on the torque multiplication of your torque convertor at lower speeds. https://gearbox-auto08517.blogdanica.com/34105306/gearbox-auto-can-be-fun-for-anyone