The very first automatic transmission to use a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 design calendar year. In typical driving, the Dynaflow made use of only the major gear, depending on the torque multiplication from the torque convertor https://josuexgkmm.develop-blog.com/41173465/the-fact-about-gearbox-auto-that-no-one-is-suggesting