The 1st automatic transmission to use a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was released for that 1948 model calendar year. In ordinary driving, the Dynaflow made use of just the best gear, depending on the torque multiplication on the torque convertor at https://cruzetfpx.tokka-blog.com/34046915/the-fact-about-gearbox-auto-that-no-one-is-suggesting