The first automatic transmission to use a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 model year. In normal driving, the Dynaflow used only the top rated gear, depending on the torque multiplication on the torque convertor at lower speeds. The https://gearbox-auto31862.blogdemls.com/33686628/gearbox-auto-secrets