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Chevy C1500 Silverado Rear End Noise

Q. I have a 1992 Chevy C1500 Silverado, 4.3 liter V-6, automatic transmission. It has 264,000 miles. Rear ABS only. I replaced the rear shocks about six months ago, the rear brakes were changed a few days ago in attempt to locate the noise. One of the brake pads was cracked. When I begin to slow down to stopping speed I hear a noise coming from what seems to be the rear wheels.

Chevy C1500 Silverado Rear End Noise

This noise started about two months ago. It sounds like a low frequency vibration, something rubbing or vibrating against something else. As the speed drops below about 10 miles per hour, the vibration frequency goes down. I have had the rear brakes checked, I have made sure the rear shock bolts were secure, and looked for obvious hoses and such that could be rubbing against something with no luck.

It seems to be getting worse, and now it sounds like it is coming from inside the small wheel cover on the drivers side. I never hear the noise when I am accelerating, and it is not always present, even at low speeds. If I apply the brakes, it diminishes some, if I brake hard the noise stops completely.

I am wondering if I may have a problem in the differential or axles. I am not sure the last time the differential was serviced. I do almost all of my own oil changes and lubes.

Larry

A. If you had trouble inside the rear I would think it would not change or go away. Most bearing problems don't fix themselves! Have you removed the drive shaft and checked the u-joints? This would be my first suggestion. Both joints should move free. If okay, I would take it in and have it run on a lift to try to isolate this noise.

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