The 1st automatic transmission to employ a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was released with the 1948 design 12 months. In ordinary driving, the Dynaflow utilised just the prime gear, counting on the torque multiplication of the torque convertor at decreased speeds. https://emiliojoonm.azzablog.com/34315472/the-single-best-strategy-to-use-for-gearbox-auto