[Yetti]

Just from what I know theres a couple things to try. number one is to pull your skid plates. if the vibration is from them you will know right away. secondly the rear mount of the diff is right on the crossmember the plates mount to. see to it that its tight and not grounded out on the crossmember. the worst thing is that oil filters dump on the mount and oil will break down the rubber. also look at the flanges on the halfshafts. make sure all the bolts are in.