The primary automatic transmission to use a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 design year. In regular driving, the Dynaflow applied just the prime gear, depending on the torque multiplication in the torque convertor at lower speeds. The https://waylonhtbin.spintheblog.com/34183210/indicators-on-gearbox-auto-you-should-know