The 1st automatic transmission to employ a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched for your 1948 design 12 months. In standard driving, the Dynaflow utilised only the top equipment, counting on the torque multiplication of the torque convertor at decrease speeds. https://dallaskamyk.activablog.com/32950043/gearbox-auto-an-overview