The initial automatic transmission to work with a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 model year. In standard driving, the Dynaflow made use of just the best gear, depending on the torque multiplication of your torque convertor at https://gearbox-auto19639.thelateblog.com/34644772/a-review-of-gearbox-auto