The primary automatic transmission to utilize a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 design 12 months. In ordinary driving, the Dynaflow utilised only the top rated gear, depending on the torque multiplication of the torque convertor at decreased speeds. https://gearbox-auto31863.topbloghub.com/39990550/indicators-on-gearbox-auto-you-should-know