The very first automatic transmission to implement a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was released for your 1948 product year. In usual driving, the Dynaflow utilized only the top rated gear, counting on the torque multiplication with the torque convertor at reduce speeds. https://stephengszac.p2blogs.com/33049494/the-basic-principles-of-gearbox-auto