The first automatic transmission to employ a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was introduced for your 1948 design 12 months. In normal driving, the Dynaflow utilized just the leading gear, relying on the torque multiplication in the torque convertor at decrease speeds. https://gearboxauto53061.targetblogs.com/34616278/5-simple-statements-about-gearbox-auto-explained