The main automatic transmission to utilize a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design yr. In standard driving, the Dynaflow utilised just the prime equipment, relying on the torque multiplication from the torque convertor at lower speeds. https://becketthsdud.blogozz.com/33270027/the-smart-trick-of-gearbox-auto-that-no-one-is-discussing