The primary automatic transmission to implement a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was introduced for that 1948 model calendar year. In regular driving, the Dynaflow utilized just the major equipment, counting on the torque multiplication on the torque convertor at reduced speeds. https://gearbox-auto66432.verybigblog.com/33018932/5-easy-facts-about-gearbox-auto-described