Question about 1999 Chevrolet Silverado 1500

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9Z71 grinding in 4 WD

I have a 1999 silverado Z71. When I engage to 4 HI I hear a grinding noise in the front end only when I turn the wheel left or right. No problems in 2 WD.

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  • Anonymous Feb 14, 2009

    I have the same grinding on my 2005 silverado when turning left or right but it does it in 2wd as well as 4wd

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This sounds like a constant velocity joint in the axle shaft that runs from the center of the front differential to each wheel. When they go bad or are full of mud they can just pop if they have grease in them or they can just grind and pop if they are full of mud. I say this due to the fact it only occurs during the turning process that it makes this noise.

Posted on Nov 22, 2011

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That Sounds a lot like you have a Gear Broken off inside the Transfer Case. Not a Cheap fix or Easy Either But, Necessary

Posted on Jan 24, 2009

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It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
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