Three primary control devices regulate the movement of the control valves in the automatic transmission's valve body assembly. The first is the manual valve, which is connected to the selector lever by a flexible cable. Moving the lever changes the setting of the valve and produces the necessary application of hydraulic pressure for the drive range selected. The second primary control device, the throttle pressure valve, is operated by the accelerator cable and makes the transmission responsive to engine speed and load. The third primary control device, the governor, controls ATF pressure relative to the output shaft rotational speed, making the transmission responsive to rear wheel speed.