The first automatic transmission to employ a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced for that 1948 model year. In usual driving, the Dynaflow applied just the leading equipment, counting on the torque multiplication in the torque convertor at lower speeds. https://daltonfmmqn.life3dblog.com/33077645/new-step-by-step-map-for-gearbox-auto