The very first automatic transmission to employ a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 model yr. In typical driving, the Dynaflow utilized just the prime gear, relying on the torque multiplication on the torque convertor at lower speeds. https://gearboxauto53062.bloggerchest.com/34067368/top-latest-five-gearbox-auto-urban-news