Main Valve Body
The main valve body contains shift valve C, the D inhibitor valve, the reverse inhibitor valve, the lock-up shift valve, the lubrication regulator valve, the lubrication shift valve, the ATF pump drive gear, the ATF pump driven gear, and the 4th/reverse air check valve. The primary function of the main valve body is to switch fluid pressure on and off to control hydraulic pressure going to the hydraulic control system.