I have a loud squeeling sound coming from underneath the truck. When it first started it was only under acceleration and now its when i hit a bump or even slowing down it sometimes does it. I jacked the rear end up and put it on jack stands and put it in drive and let it spin but no u joints made any noise. I was thinking it could have been the wheelbearing but i replaced those and it still does it, but only after everything gets hot. I dont know what else it could be. It sounds like a dying cat!