The very first automatic transmission to utilize a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 model year. In normal driving, the Dynaflow made use of just the prime gear, relying on the torque multiplication of the torque convertor https://brooksclqss.bloggosite.com/41068219/the-fact-about-gearbox-auto-that-no-one-is-suggesting