Jingling Noise....
Don't know if this will help but worth a shot. We had a jingling noise a while back. It was driving me crazy not being able to find it. I did find it and it was the factory brush guard. One of the welds broke. This is a problem with the factory brush guards. Did a little sanding, welded it and no more rattle. When in the hummer it did sound like it was underneath but it wasn't.



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