The primary automatic transmission to use a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 product year. In typical driving, the Dynaflow made use of only the leading gear, counting on the torque multiplication with the torque convertor at https://gearboxauto43073.luwebs.com/34835350/details-fiction-and-gearbox-auto