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Re: My 2003 chevy z71 has a grinding noise in the rear...
Sounds serious but without hearing the noise its difficult to diagnose ,ask a local mechanic to have a listen and then post what he said so any mechanic might be able to help or verify
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Run vehicle while on hoist/Listen w/Stethoscope.....Sometimes the 'sound' travels throughout the drive train components & can be tough to pinpoint...Time for a pro !!
It sounds like you may have a bearing or CV joint going out. Your vehicle will need to be jacked up and inspected. It may be more than one problem too. Its possible the dragging noise could be something between brake pads and rotor, but the grinding that comes and goes in reference to direction sounds like a bearing or joint. I would take it to a professional right away and ask for an estimate only, and then get other estimates from other shops as well. Good luck to you.
I had a similar problem with 03 Dakota Quad Cab. I have the towing package withe positrac rear end. The rear end was giving some pretty good clunks especially noticeable in reverse. Had the rear differential oil service done with recommended additives. Noise is gone. A second problem I had was the lower steering shaft assy u joints were worn. Steering "klunked". Changed out the shaft and klunk disappeared. Good Luck!
Check drive shaft assembly for worn u-joints.if OK check for worn pinion bearings or loose pinion nut.This can all be check shaking drive shaft at each end and looking for slop in u-joints or pinion flange.
This sounds like the famous problem that those ten bolts give, remove the rear differential cover and inspect the oil for metal debris, it's more than likely to be the carrier bearings wornout making the ring and pinion offmesh causing the grinding and will eventually break. Hope this helps
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