The initial automatic transmission to work with a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was released to the 1948 model year. In normal driving, the Dynaflow employed just the best gear, relying on the torque multiplication of the torque convertor at decrease speeds. https://caidenahlno.bluxeblog.com/66239801/new-step-by-step-map-for-gearbox-auto