The main automatic transmission to work with a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 product year. In typical driving, the Dynaflow applied just the leading equipment, depending on the torque multiplication of the torque convertor at lower speeds. https://sethjopol.suomiblog.com/a-review-of-gearbox-auto-49769974