The 1st automatic transmission to utilize a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was introduced for your 1948 model yr. In regular driving, the Dynaflow used just the major gear, counting on the torque multiplication on the torque convertor at decrease speeds. The Dynaflow https://landenenpss.tinyblogging.com/the-fact-about-gearbox-auto-that-no-one-is-suggesting-77814658