The very first automatic transmission to make use of a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 design year. In usual driving, the Dynaflow used just the major gear, depending on the torque multiplication with the torque convertor at https://gearbox-auto53185.blue-blogs.com/41075841/a-secret-weapon-for-gearbox-auto