The main automatic transmission to employ a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 product calendar year. In standard driving, the Dynaflow utilised only the top gear, relying on the torque multiplication of the torque convertor at lower speeds. https://gearbox-auto43074.aboutyoublog.com/38067578/not-known-facts-about-gearbox-auto