The first automatic transmission to use a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 model calendar year. In usual driving, the Dynaflow applied just the best gear, depending on the torque multiplication with the torque convertor at lessen speeds. The https://brooksgoqqo.shotblogs.com/a-review-of-gearbox-auto-48069547