The first automatic transmission to utilize a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 design calendar year. In standard driving, the Dynaflow employed just the top gear, depending on the torque multiplication from the torque convertor at reduced speeds. https://emilioipqpn.iyublog.com/33285787/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox-auto