Chevy CK Pickup Automatic Transmission Governors, Modulators, Parts

Automatic transmission governors and modulators are some of the most important components in non-computerized transmissions. They are designed to offer the inputs that can tell the transmission of your Chevy CK Pickup when to begin shifting gears. A governor is attached to the transmission output shaft to regulate the ATF pressure, which is based on vehicle speed. It is accomplished by utilizing centrifugal force to rotate several hinged weights which are held in place by pull-back springs. When the weights pull the springs apart, more ATF is allowed to flow through the governor to press on the shift valves that open, allowing the necessary shifts.

A vacuum modulator is designed to monitor engine vacuum using a rubber hose that is attached to the engine itself. Engine vacuum can react very precisely to engine load, with higher vacuum occurring whenever the engine is running under lighter loads, and diminishing almost down to a zero when the engine is running under heavier loads. The modulator is connected to the transmission case externally and has a shaft which is attached to the throttle valve. Whenever the engine load increases, vacuum diminishes and moves the valve in the opposite direction thus causing the transmission to shift later and much more firmly. Search through our range of Chevy CK Pickup automatic transmission governors, modulators & components produced by some of the most reputable manufacturers in the aftermarket.