The initial automatic transmission to employ a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was launched for the 1948 product 12 months. In normal driving, the Dynaflow utilized just the top rated gear, counting on the torque multiplication of the torque convertor at decreased speeds. https://gearboxauto43961.blogdosaga.com/34043721/a-secret-weapon-for-gearbox-auto