The primary automatic transmission to work with a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 design yr. In regular driving, the Dynaflow made use of only the top gear, counting on the torque multiplication in the torque convertor https://lorenzovwusq.blogdiloz.com/32815973/the-2-minute-rule-for-gearbox-auto