Have you driven it to see what vibrations you actually have in the rear driveline? Have you been able to swap the shims and test?
There's a chance that I might be available to wheel on the 29th or 30th.
I don't think I told you that my 4 year old noticed the
on your truck in the videos that I showed him and he recognized it from the ones that I have on my trash can. I had so many of them at one point that I put one on each side of my trash can.