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)APPLICATION
1983 Pontiac Grand Prix Base, 5.0 H
Section 1 (Overhaul - THM 400): Application
1983 Pontiac Grand Prix Base, 5.0 HSECTION Application
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.
TRANSMISSION APPLICATION (CADILLAC)
| Vehicle Application | Transmission |
|---|---|
| 1984 DeVille 4.1L | 400/475, M40 |
| 1984 Eldorado 4.1L | 400/475, M40 |
| 1984 Fleetwood 4.1L | 400/475, M40 |
| 1983 Fleetwood 6.0L | 400/475, M40 |
TRANSMISSION APPLICATION (CHEVROLET)
| Vehicle Application | Transmission |
|---|---|
| 1984 Chevy Van 4.1L | 400/475, M40 |
| 1985-90 Chevy Van 4.3L | 400/475, M40 |
| 1984-90 Chevy Van 5.0L | 400/475, M40 |
| 1983-90 Chevy Van 5.7L & 6.2L | 400/475, M40 |
| 1989-90 Chevy Van 7.4L | 400/475, M40 |
| 1983-88 Chassis Cab 4.8L | 400/475, M40 |
| 1983-86 Chassis Cab 5.0L | 400/475, M40 |
| 1983-90 Chassis Cab 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1983-90 Cutaway 5.7L, 6.2L | 400/475, M40 |
| 1988-90 Cutaway 7.4L | 400/475, M40 |
| 1983-90 Hi-Cube 5.7L & 6.2L | 400/475, M40 |
| 1988-90 Hi-Cube 7.4L | 400/475, M40 |
| 1984 Pickup 4.1L | 400/475, M40 |
| 1985-90 Pickup 4.3L & 5.0L | 400/475, M40 |
| 1983-88 Pickup 4.8L | 400/475, M40 |
| 1983-91 Pickup 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1983-90 RV Cutaway 5.7L & 6.2L | 400/475, M40 |
| 1988-90 RV Cutaway 7.4L | 400/475, M40 |
| 1985-86 Sportvan 4.3L | 400/475, M40 |
| 1985-86 Sportvan 5.0L | 400/475, M40 |
| 1983-90 Sportvan 5.7L | 400/475, M40 |
| 1983-90 Sportvan 6.2L | 400/475, M40 |
| 1988-89 Sportvan 7.4L | 400/475, M40 |
| 1989 Step Van 3.9L | 400/475, M40 |
| 1990 Step Van 4.3L | 400/475, M40 |
| 1983-89 Step Van 4.8L | 400/475, M40 |
| 1983-90 Step Van 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1983-90 Suburban 5.7L, 6.2L & 7.4L | 400/475, M40 |
TRANSMISSION APPLICATION (GMC)
| Vehicle Application | Transmission |
|---|---|
| 1983-88 Chassis Cab 4.8L | 400/475, M40 |
| 1983-86 Chassis Cab 5.0L | 400/475, M40 |
| 1983-90 Chassis Cab 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1983-90 Magnavan 5.7L & 6.2L | 400/475, M40 |
| 1988-90 Magnavan 7.4L | 400/475, M40 |
| 1984 Pickup 4.1L | 400/475, M40 |
| 1985-90 Pickup 4.3L, 5.0L | 400/475, M40 |
| 1983-88 Pickup 4.8L | 400/475, M40 |
| 1983-91 Pickup 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1985-86 Rally 4.3L & 5.0L | 400/475, M40 |
| 1983-90 Rally 5.7L & 6.2L | 400/475, M40 |
| 1988-89 Rally 7.4L | 400/475, M40 |
| 1983-90 Rally Camper 5.7L & 6.2L | 400/475, M40 |
| 1988-90 Rally Camper 7.4L | 400/475, M40 |
| 1983-90 Suburban 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1989 Value Van 3.9L | 400/475, M40 |
| 1990 Value Van 4.3L | 400/475, M40 |
| 1983-89 Value Van 4.8L | 400/475, M40 |
| 1983-90 Value Van 5.7L, 6.2L & 7.4L | 400/475, M40 |
| 1984 Vandura 4.1L | 400/475, M40 |
| 1985-90 Vandura 4.3L | 400/475, M40 |
| 1984-90 Vandura 5.0L | 400/475, M40 |
| 1983-90 Vandura 5.7L & 6.2L | 400/475, M40 |
| 1989-90 Vandura 7.4L | 400/475, M40 |
| 1983-90 Vandura Special 5.7L & 6.2L | 400/475, M40 |
| 1988-90 Vandura Special 7.4L | 400/475, M40 |
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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.