So for the verdict. I found out that my rearend was replaced with a used rearend a week before i bought it, so it had a warranty from the installer. They checked it out and said it was fine, but the pinion seal was bad, they said that the u-joints were good, I don't really know if I believe them, but that is an easy job that i have done many times. As for all that was done under the warranty:
Front and rear pinions seals replaced
as well as transfer case shaft seals, I think, this was done a week or so ago.
All front and rear control arm bushings replaced as well as the control arms themselves in the front or rear? Memory fading fast today.
front passanger axle seal
fluids changed in front and rear diffs and t-case with inspections
and some other things i can't remember.
No comparison in sound or behavior, so i should be good to go now.