The 1st automatic transmission to use a torque converter (as opposed to a fluid coupling) was the Buick Dynaflow, which was introduced with the 1948 product 12 months. In standard driving, the Dynaflow used just the major equipment, depending on the torque multiplication of your torque convertor at decreased speeds. https://elliotteebzv.blogmazing.com/32952942/facts-about-gearbox-auto-revealed