The 1st automatic transmission to employ a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was released for the 1948 product 12 months. In regular driving, the Dynaflow made use of only the major gear, depending on the torque multiplication of your torque convertor https://gearbox-auto31963.ttblogs.com/13446783/not-known-details-about-gearbox-auto