The first automatic transmission to implement a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was released for the 1948 product calendar year. In normal driving, the Dynaflow applied just the best gear, counting on the torque multiplication in the torque convertor at reduce speeds. https://gearbox-auto32963.blogsuperapp.com/34349448/top-gearbox-auto-secrets