The primary automatic transmission to use a torque converter (as an alternative to a fluid coupling) was the Buick Dynaflow, which was released for that 1948 product yr. In standard driving, the Dynaflow employed only the prime gear, relying on the torque multiplication of the torque convertor at reduce speeds. https://marcoktwxz.humor-blog.com/33071825/gearbox-auto-things-to-know-before-you-buy