The main automatic transmission to work with a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was released for the 1948 product calendar year. In usual driving, the Dynaflow used only the best gear, depending on the torque multiplication with the torque convertor at https://collinrwvsn.digitollblog.com/33962380/a-review-of-gearbox-auto