I noticed it a few weeks ago when under heavier than normal acceleration it was vibrating and squeaking in the rear. I have a 3” lift and no sye so I put a 1” tcase drop and both new u-joints in the rear driveshaft this past weekend thinking that would fix it. It took care of 90% of the vibration when accelerating but the squeaking is still there. I don’t notice either of them any time other than taking off quickly. I have 3.73s and trackloc if that matters. I am thinking maybe wheel bearings.