The initial automatic transmission to make use of a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 model yr. In standard driving, the Dynaflow employed only the best gear, counting on the torque multiplication from the torque convertor at https://gearbox-auto64296.snack-blog.com/33753047/facts-about-gearbox-auto-revealed