The 1st automatic transmission to work with a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 model yr. In normal driving, the Dynaflow utilized only the leading gear, counting on the torque multiplication on the torque convertor at reduce speeds. https://arthurxdfgg.dsiblogger.com/67159931/a-secret-weapon-for-gearbox-auto