The main automatic transmission to make use of a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was released for your 1948 design year. In regular driving, the Dynaflow made use of only the top rated gear, relying on the torque multiplication of the torque convertor https://shanezazwu.blogaritma.com/32101967/5-easy-facts-about-gearbox-auto-described