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Crap, looks like I am in the same boat. I have been telling my dealer for a while now about it. No I am modded. Got to see how this plays out. I wonder if you have the dealership do the latest ECM/TCM updates it will only show the last GM CVN? That should take care of the warrantee deal with tuning. I am sure I also have the dang rear end thing as well. It groans pretty bad in the mornings while it is still cold.
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