The very first automatic transmission to work with a torque converter (rather than a fluid coupling) was the Buick Dynaflow, which was introduced for the 1948 model year. In regular driving, the Dynaflow used only the top rated gear, relying on the torque multiplication in the torque convertor at lower https://deanlljgd.jts-blog.com/32790372/indicators-on-gearbox-auto-you-should-know