The 1st automatic transmission to utilize a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 design year. In normal driving, the Dynaflow used only the best equipment, depending on the torque multiplication in the torque convertor at decrease speeds. The Dynaflow https://gearbox-auto53196.bloggosite.com/40525751/detailed-notes-on-gearbox-auto