The primary automatic transmission to work with a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 product calendar year. In normal driving, the Dynaflow utilized only the best equipment, relying on the torque multiplication on the torque convertor at decreased speeds. https://simoncikki.thezenweb.com/rumored-buzz-on-gearbox-auto-72169883