The 1st automatic transmission to use a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 model calendar year. In regular driving, the Dynaflow made use of just the best gear, relying on the torque multiplication of the torque convertor https://emilianoyjotv.shoutmyblog.com/33303621/top-guidelines-of-gearbox-auto