The 1st automatic transmission to use a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was introduced for that 1948 design year. In ordinary driving, the Dynaflow employed only the prime equipment, depending on the torque multiplication of your torque convertor at lower speeds. The Dynaflow https://sethzhkml.blog4youth.com/34779237/gearbox-auto-fundamentals-explained