The main automatic transmission to implement a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was released for the 1948 model year. In ordinary driving, the Dynaflow utilized only the top rated gear, relying on the torque multiplication of the torque convertor at lower speeds. The https://manuelpwwwu.full-design.com/new-step-by-step-map-for-gearbox-auto-76521635