The main automatic transmission to work with a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 model year. In normal driving, the Dynaflow used just the best gear, counting on the torque multiplication with the torque convertor at reduced speeds. The https://gearbox-auto70357.blog2freedom.com/33791764/the-basic-principles-of-gearbox-auto