I'm hearing a whine in my rear diff again. Complete rear axle assembly was replaced at around 60000km and now at 120000km I'm having issues again. I took it to a driveline shop last week to have it looked at and they said the diff was fine and ended up replacing the axle bearings on both sides. I picked it up after hours on Friday so I was unable to speak with them about the noise they didn't fix. Today I was under the truck checking it out and was able to move my pinion up and down enough to hear a small clunk. I'm thinking any movement up and down is too much. Opinions??? Could this be causing my noise??