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.
1966 Chevrolet P30 Series 4.8L Eng, Automatic Trans, Trans Mfr CD PowerglideFACTORY OEM SERVICE PROCEDURE
Mufflers And Resonators
| Condition | Code | Procedure |
|---|---|---|
| Body shell distorted, affecting performance or structural integrity | A | Require replacement |
| Corrosion Hole | A | Require replacement |
| Missing | C | Require replacement |
| Mounting bracket broken | A | Require repair or replacement |
| Mounting bracket cracked | B | Require repair or replacement |
| Nipple Cracked | A | Require repair or replacement |
| Nipple Loose | B | Require replacement |
| Outer wrap peeling (Exhaust Not Leaking) | 1 | Suggest replacement |
| Plugged | A | Require replacement |
| Puncture (other than drain hole) | A | Require replacement |
| Rattling or knocking noise from inside muffler | B | Require replacement |
| Seam open (exhaust leaking) | A | Require replacement |
| Sound quality unsatisfactory | 2 | Suggest replacement to address customer need and/or request |
| Split (exhaust leaking) | A | Require replacement |
|
NOTE:
Further diagnosis required to determine cause of the split seam (i.e. Backfiring).
|
||
| Weak due to corrosion, but no leaks present | 1 | Suggest replacement |
Factory Service Tools
Use the Manual With the Right Hardware
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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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