I have a 2011 Silverado with 14,xxx miles. I recently took it in to my local Chevy dealer for a noise that developed in the rear end. The noise is a sort of banging noise when going over a bump with the front wheels turned. I most notice it when backing out of my driveway, as it has the usual low curb that most subdivisions have. The dealer told me that it was a normal noise caused by the rear axle shaft shifting and hitting the axle retaining pins. I don't think that is normal, and it never did it until recently.

Any ideas?