The initial automatic transmission to work with a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was released for the 1948 design calendar year. In typical driving, the Dynaflow utilised just the best equipment, relying on the torque multiplication from the torque convertor at lower speeds. https://gearbox-auto24791.life3dblog.com/32755212/gearbox-auto-fundamentals-explained