Howling noise from rear end when turning and a clunking from rear end when going forward. Wheel bearings or something else?
Sounds like something else, best to pull of the diff cover and take a look, if there is metal in the old lube then it is most likely time to rebuild the rear end or look for a good used one.
Search Jeep Grand Cherokee Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Jeep Grand Cherokee Experts