The very first automatic transmission to employ a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was released for that 1948 product 12 months. In standard driving, the Dynaflow employed only the top gear, counting on the torque multiplication on the torque convertor at decrease speeds. https://gearbox-auto30628.digiblogbox.com/58833861/gearbox-auto-can-be-fun-for-anyone