The first automatic transmission to use a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 product year. In ordinary driving, the Dynaflow used just the leading equipment, counting on the torque multiplication on the torque convertor at decreased speeds. https://griffinabawx.blogitright.com/33780405/the-fact-about-gearbox-auto-that-no-one-is-suggesting