The main automatic transmission to utilize a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was launched with the 1948 product yr. In regular driving, the Dynaflow used just the top gear, depending on the torque multiplication in the torque convertor at lower speeds. The Dynaflow https://gearboxauto53061.targetblogs.com/34616277/the-smart-trick-of-gearbox-auto-that-no-one-is-discussing