The very first automatic transmission to work with a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was released with the 1948 product year. In regular driving, the Dynaflow applied only the major equipment, counting on the torque multiplication with the torque convertor at decreased speeds. https://hectormsvvu.therainblog.com/33048590/5-simple-techniques-for-gearbox-auto