The 1st automatic transmission to use a torque converter (instead of a fluid coupling) was the Buick Dynaflow, which was launched for that 1948 model year. In usual driving, the Dynaflow employed just the best gear, relying on the torque multiplication in the torque convertor at reduce speeds. The Dynaflow https://cruzhoppo.getblogs.net/66721144/the-gearbox-auto-diaries