The initial automatic transmission to implement a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design 12 months. In regular driving, the Dynaflow utilised only the prime gear, depending on the torque multiplication with the torque convertor at lessen speeds. https://gearbox-auto66432.verybigblog.com/33018932/5-easy-facts-about-gearbox-auto-described