The very first automatic transmission to make use of a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 model year. In normal driving, the Dynaflow applied just the leading equipment, counting on the torque multiplication from the torque convertor at https://claytonnplfa.isblog.net/top-guidelines-of-gearbox-auto-51292322