The main automatic transmission to implement a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design calendar year. In normal driving, the Dynaflow utilised just the top gear, counting on the torque multiplication with the torque convertor at lower speeds. The https://kamerontjvcm.ampedpages.com/an-unbiased-view-of-gearbox-auto-60632854