The primary automatic transmission to implement a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released for that 1948 design yr. In ordinary driving, the Dynaflow made use of only the top rated gear, counting on the torque multiplication of the torque convertor at https://gearbox-auto15890.blogrelation.com/40009371/the-basic-principles-of-gearbox-auto