Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1983GRAND PRIX BASE, 5.0 HREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (OVERHAUL - THM 400)TRANSMISSION REASSEMBLYCONTROL VALVE BODY ASSEMBLY
1983 Pontiac Grand Prix Base, 5.0 H
Control Valve Body Assembly
1983 Pontiac Grand Prix Base, 5.0 HSECTION Control Valve Body Assembly
WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
- Install control valve-to-spacer gasket. Install interchangeable governor pipes on control valve assembly. Install governor screen assembly with pointed end up. Install governor oil pipes and control valve assembly.
- Use care when aligning governor feed pipe over screen. Ensure gasket and spacer plate are not moved out of position and manual valve is indexed properly with pin on detent lever. Ensure governor pipes are seated in case holes.
- Using 2 guide pins, install control valve assembly and governor pipes on transmission. Be careful when aligning governor feed pipe over screen. Ensure gasket and spacer plate are not moved out of position and manual valve is indexed properly with pin on detent lever. Ensure governor pipes are properly seated in case holes.
- Start control valve body-to-case bolts. Remove guide pins. Install detent roller and spring assembly. Install and tighten remaining attaching bolts. Tighten solenoid attaching screws.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.