The primary automatic transmission to make use of a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was released to the 1948 design year. In standard driving, the Dynaflow utilized only the major equipment, counting on the torque multiplication from the torque convertor at decrease speeds. https://charlieoxciq.blogofchange.com/34373397/top-gearbox-auto-secrets