Noisy Rear End

[swarggs]

Does anyone else notice a whining noise from their rear end? I noticed it when I switched from my more aggressive winter wheels to my summer 22's. It is more noticeable at lower speeds where road noise cannot drown it out..

After noticing it I changed my differential fluid. The level was optimal before changing and the fluid looked good. I also replaced my rear pads and rotors with no change. I ran the truck on a lift to make sure it wasn't road noise from my tires too.
IDK if it's always been overly noisy and I'm just focused on it now or what. Any insight?

 

[AllAmer1719]

Well I think time has come that I replace my rear diff bearings. I’m at 117k miles and getting a whine noise. Replaced fluid as well. You end up doing the same?