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My 2009 GMC Sierra make a rumbling noise when I shift it 4 wheel drive it the makes a thumping sound shortly after  when I go into rear drive. Any ides

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3 hours ago, Jim tait said:

My 2009 GMC Sierra make a rumbling noise when I shift it 4 wheel drive it the makes a thumping sound shortly after  when I go into rear drive. Any ides

No error codes?  Did you check the u-joints and yokes?

Posted

how does the fluid in the transfer case look?  if its all sparkles you have a problem. also check the fluid in the front differential and make sure there's some in there 

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