These three components are important to the earlier pre-computerized transmissions. They provide the hydo-mechanical inputs that tell the transmission when to shift. The Governor is driven by the output shaft and regulates hydraulic pressure based on vehicle speed. It accomplishes this using centrifugal force to spin a pair of hinged weights against return springs. As [...]

An automatic transmission has a heart of sorts. It is called a pump. There are several styles of pumps that we will get into in a few minutes. The pump in an Automatic transmission pumps the oil through out the transmission in order to make pressure, which we call hydraulic pressure. The fluid flows through [...]