The first automatic transmission to work with a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design calendar year. In ordinary driving, the Dynaflow made use of only the leading equipment, depending on the torque multiplication on the torque https://gearbox-auto21850.tinyblogging.com/the-smart-trick-of-gearbox-auto-that-no-one-is-discussing-77814652