The 1st automatic transmission to utilize a torque converter (in lieu of a fluid coupling) was the Buick Dynaflow, which was launched to the 1948 model year. In normal driving, the Dynaflow used just the prime gear, depending on the torque multiplication with the torque convertor at lower speeds. The https://gearboxauto42963.blogoscience.com/40423775/5-simple-techniques-for-gearbox-auto