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.
1983 Chevrolet Step Van P20, 4.8 T, Automatic, 475/M40FACTORY OEM SERVICE PROCEDURE
Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) |
|---|---|
| Case-to-Center Support Bolt | 20-25 (27-34) |
| Case-to-Engine Bolt | 30-35 (41-47) |
| Engine Rear Mount-to-Transmission | 30-35 (41-47) |
| Engine Rear Support Bracket-to-Frame Nut | 30-35 (41-47) |
| Extension Housing-to-Case Bolt | 20-25 (27-34) |
| Flywheel-to-Converter Bolt | 30-35 (41-47) |
| Governor Cover-to-Case | 15-20 (20-27) |
| Manual Shaft-to-Detent Lever Nut | 15-20 (20-27) |
| Manual Yoke-to-Manual Shaft Nut | 13-18 (18-24) |
| Oil Cooler Pipe-to-Case | 26-30 (35-41) |
| Oil Cooler Pipe-to-Radiator | 26-30 (35-41) |
| Parking Pawl Bracket-to-Case Bolt | 15-20 (20-27) |
| Pump Assembly-to-Case Bolt | 15-20 (20-27) |
| Pump Body-to-Cover Bolt | 15-20 (20-27) |
| Rear Servo Cover-to-Case Bolt | 15-20 (20-27) |
| Vacuum Modulator Retainer-to-Case Bolt | 15-20 (20-27) |
| INCH Lbs. (N.m) | |
| Control Valve Assembly-to-Case Bolt | 72-120 (8-14) |
| Filter-to-Valve Body Bolt | 72-120 (8-14) |
| Flywheel Housing Cover-to-Transmission Bolt | 48-72 (5-8) |
| Line Pressure Plug | 60-120 (7-14) |
| Oil Pan-to-Case Bolt | 72-120 (8-14) |
| Solenoid-to-Case Bolt | 48-120 (5-14) |
| Speedometer Driven Gear Retainer-to-Case Bolt | 48-72 (5-8) |
| Switch Assembly | 24-42 (3-5) |
Factory Service Tools
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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.
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