The very first automatic transmission to implement a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design 12 months. In typical driving, the Dynaflow utilised just the top gear, depending on the torque multiplication from the torque convertor at reduced speeds. https://gunnervazzw.popup-blog.com/33217738/the-fact-about-gearbox-auto-that-no-one-is-suggesting