The very first automatic transmission to work with a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 design year. In normal driving, the Dynaflow employed just the prime equipment, counting on the torque multiplication on the torque convertor at https://gearboxauto74283.blogdon.net/not-known-facts-about-gearbox-auto-50205947