The 1st automatic transmission to employ a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 model calendar year. In ordinary driving, the Dynaflow utilized only the top rated equipment, counting on the torque multiplication on the torque convertor at decrease speeds. https://gearbox-auto31963.blogs100.com/34135673/the-5-second-trick-for-gearbox-auto