The initial automatic transmission to employ a torque converter (in place of a fluid coupling) was the Buick Dynaflow, which was introduced to the 1948 product calendar year. In regular driving, the Dynaflow used only the best equipment, depending on the torque multiplication of the torque convertor at lessen speeds. https://gearbox-auto21853.theideasblog.com/34276565/indicators-on-gearbox-auto-you-should-know