The 1st automatic transmission to implement a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched for the 1948 model calendar year. In usual driving, the Dynaflow applied only the major equipment, counting on the torque multiplication from the torque convertor at lower speeds. https://gearboxauto52951.glifeblog.com/33097265/the-5-second-trick-for-gearbox-auto