The primary automatic transmission to use a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 product 12 months. In standard driving, the Dynaflow utilized just the top rated gear, counting on the torque multiplication on the torque convertor at reduce speeds. https://gearbox-auto42963.izrablog.com/34300170/5-easy-facts-about-gearbox-auto-described