The 1st automatic transmission to employ a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was released for your 1948 design calendar year. In ordinary driving, the Dynaflow utilised only the best gear, depending on the torque multiplication on the torque convertor at lessen speeds. https://gearbox-auto31963.ttblogs.com/13446783/not-known-details-about-gearbox-auto