The primary automatic transmission to use a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was introduced for that 1948 design calendar year. In normal driving, the Dynaflow applied just the best equipment, counting on the torque multiplication of the torque convertor at decrease speeds. https://gearboxauto77417.digiblogbox.com/58833239/details-fiction-and-gearbox-auto