Thank you all. I was about to buy a 2015 LTZ or a Yukon XL they both did this and I heard it. It bugged me but the sales guy was talking so I thought it was in my head. I have driven an 09 Ram 1500 for 7 years and sold it for something bigger. It rhode great but the transfer case was going out and caused rogue vibrations. The last thing I would want is to throw down 40k and find out I have this buffeting business. I might just buy a 2014 or older instead. It works out nice as I was dreading the payments anyway. Thanks again!