The 1st automatic transmission to use a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched for your 1948 product 12 months. In standard driving, the Dynaflow employed just the best equipment, relying on the torque multiplication of your torque convertor at decreased speeds. https://gearbox-auto19741.angelinsblog.com/32962127/indicators-on-gearbox-auto-you-should-know