The 1st automatic transmission to utilize a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was launched for the 1948 design calendar year. In typical driving, the Dynaflow utilized only the major equipment, depending on the torque multiplication from the torque convertor at lessen speeds. https://damienitfmr.dailyhitblog.com/39212889/a-review-of-gearbox-auto