The very first automatic transmission to utilize a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was introduced for that 1948 product calendar year. In normal driving, the Dynaflow used just the top rated gear, counting on the torque multiplication on the torque convertor at https://gearboxauto08630.azzablog.com/33955050/the-5-second-trick-for-gearbox-auto