If the outer bearings can go bad, so can an inner bearing. A close visual inspection will usually reveal a bad bearing or you can feel it when you spin the bearing. You could check the gear grease in the rear end. Bearings in there can go bad.
SOURCE: 4.2L 2006 Trailblazer
Don' t be so quick to think that it is the bearings. If the noise gets louder with acceleration try the alternator tensioner first. Mine was doing the same thing. Whining noise at start up and louder upon acceleration. Replaced alternator tensioner and the noise is gone. Hope this helps
SOURCE: how to change my front differential seal and
That will be a Huge job. The whole front diff must come out of the car and the case will need to be taken apart to even gain acess to the carrier side bearings.
The hub bearing is where the wheel bolts up is that maybe what you are talking about?
Also the axle seal isn't that bad to do you need to remove the cv shaft then it's just a simple remove the seal and install the new one.
But all of these jobs will be big ones.
SOURCE: I have a 2005 Chevy
ok it could be two things. it could be rear wheel bearings or a rear diff. If its a high pitch wine then its worn gears in your differential. its needs serviced or replaced. If it more of a rumbling or grinding hum, coming only from one side or both) then there are bad wheel bearings.
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