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02 Silverado z71 rear end issues
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king
New User
Feb 23, 2012, 8:56 PM
Post #1 of 4
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02 Silverado z71 rear end issues
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02 Chevrolet Silverado 1500 LS Z-71 regular cab short bed. 5.3 liter gas. 98000 miles. G80 rear end. I have been having an intermittent metal rubbing sound coming from the rear end for the past several months. The most common situation where it occurs is going around a sharp right hand curve with a good bit of speed. I thought it was brakes at first and had firestone do the rear brakes. The problem persisted. I thought myself it might be the outer wheel bearing as the sound seems to come from the rear left side. I took it to a Chevy dealership and they could find nothing wrong. Then I tried a local shop and they drove it around and could not produce the noise I was hearing. They had it on the lift and could hear some light noise coming from the rear end. They thought it might be the clutch in the rear end. I had them service the rear end and a small piece of a tooth came out with the old gear oil. The sound persists, but seems to be muffled a bit now which makes me think the new oil affected it and the problem is in the rear end and not a wheel bearing. I am guessing I am at a point of rebuilding or replacing. Should I have someone rebuild my rear end? Can I buy an aftermarket rear differential and that bolt up and work? What should I do here?
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re-tired
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/ Moderator
Feb 23, 2012, 9:28 PM
Post #2 of 4
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Re: 02 Silverado z71 rear end issues
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You did not say if it was a posi rear end or not . If it is there is a additive that must be added to the fluid . BUT if you have piece of internal workings if its a tooth its probably a side (spider) gear, in the oil you may consider getting it rebuilt or a low milage salvage complete axle. Either way be sure to get the same ratio. LIFE'S SHORT GO FISH
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king
New User
Feb 23, 2012, 9:45 PM
Post #3 of 4
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Re: 02 Silverado z71 rear end issues
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It's a posi-track rear end. The guys at the shop I spoke to spoke of the additive having to be added to the fluid, so I assume they did it. I thought about trying to find a used rear axle assembly, but craigslist and a few salvage yard inventory checks have yielded no results. I'm in Arkansas and rear lockers are prime pieces of equipment here. Would a rebuild be economical parts/labor wise over getting an aftermarket rear differential? I have read the G80 rear ends are subject to failure with hard use and I would believe it. I have never towed anything or hailed over 400 pounds in it, and that was like twice.
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re-tired
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Feb 23, 2012, 11:25 PM
Post #4 of 4
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Re: 02 Silverado z71 rear end issues
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If your going to keep truck and its in good shape then in my experiance an Aurburn posi unit is top of the line.I've installed several in everything from a stock truck to a mud racer. Expect to drop $500+ - P&L . If too rich for you ,go to a dealer and order a set of spider gears,have a shop install. Auburn, Lockers, Eaton Posi Units for Cars & Trucks LIFE'S SHORT GO FISH
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