The first automatic transmission to utilize a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was launched with the 1948 design year. In usual driving, the Dynaflow used only the best gear, relying on the torque multiplication with the torque convertor at reduced speeds. The https://gearboxauto87417.howeweb.com/34792830/new-step-by-step-map-for-gearbox-auto