The 1st automatic transmission to work with a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was launched with the 1948 product 12 months. In usual driving, the Dynaflow made use of only the top gear, counting on the torque multiplication of your torque convertor https://hectorseowb.blogpixi.com/34044223/about-gearbox-auto