The very first automatic transmission to work with a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was launched for your 1948 model year. In normal driving, the Dynaflow used just the major equipment, depending on the torque multiplication from the torque convertor at decrease https://gearbox-auto87306.answerblogs.com/34005930/the-basic-principles-of-gearbox-auto