The primary automatic transmission to utilize a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was released to the 1948 product year. In usual driving, the Dynaflow used only the top rated equipment, relying on the torque multiplication in the torque convertor at decreased speeds. https://gearbox-auto21852.loginblogin.com/41512435/not-known-facts-about-gearbox-auto