The 1st automatic transmission to make use of a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was introduced for your 1948 model 12 months. In usual driving, the Dynaflow used only the leading gear, counting on the torque multiplication of the torque convertor at https://gearbox-auto31962.blogolize.com/not-known-details-about-gearbox-auto-73177227