The first automatic transmission to use a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 product yr. In typical driving, the Dynaflow utilised only the top gear, depending on the torque multiplication on the torque convertor at reduce speeds. The Dynaflow https://jaidenkuzbc.goabroadblog.com/33225147/gearbox-auto-things-to-know-before-you-buy