The 1st automatic transmission to employ a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was released for that 1948 product year. In ordinary driving, the Dynaflow applied only the top gear, counting on the torque multiplication on the torque convertor at reduced speeds. The https://gearbox-auto90987.tkzblog.com/33593429/detailed-notes-on-gearbox-auto