The main automatic transmission to make use of a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was released for the 1948 design calendar year. In typical driving, the Dynaflow used just the top rated equipment, counting on the torque multiplication in the torque convertor https://gearbox-auto42962.canariblogs.com/facts-about-gearbox-auto-revealed-49004039