that's just what it sounds like to me if you are just cruising and not hitting the brakesNope just got it. Was going to go and do the service on the front rear and tcase. Just did the trans and a couple solenoids. Really hope I don’t have to fix the diff. I’m already doing the rear main seal and plate this weekend! lol
but you could get under there and take a look at the u joints, parking brake, etc basically rule stuff in or out
you could also grab it try to wiggle it and see if it has any play at all, shouldn't have any, if it is leaking that's usually a clue
also check the differential fluid level, should be up to the fill hole or a hair under if it has a regular diff cover