The very first automatic transmission to implement a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 product calendar year. In regular driving, the Dynaflow applied only the prime gear, depending on the torque multiplication on the torque convertor at decrease speeds. https://charlierchjo.elbloglibre.com/34123956/examine-this-report-on-gearbox-auto