The first automatic transmission to implement a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 product year. In typical driving, the Dynaflow utilized just the leading gear, relying on the torque multiplication on the torque convertor at lower speeds. https://gearbox-auto32951.bluxeblog.com/66239050/5-essential-elements-for-gearbox-auto