The first automatic transmission to work with a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was launched for your 1948 product 12 months. In standard driving, the Dynaflow applied only the top gear, depending on the torque multiplication of your torque convertor at https://deanlljgd.jts-blog.com/32790372/indicators-on-gearbox-auto-you-should-know