I got a vibration rattle noise. it started about 2 weeks ago. I finally got to the dealer yesterday and after an hour and half they told me that they are going to replace the whole rear end. I'm not sure if anyone else has and any issue like this. My truck is a 2010 with 20k.
took the truck in this morning. dealer said it was bearings that were bad from the factory. now my rear axle has been replaced. hope this helps anyone out there with a similar problem.