When I make turns I hear the rear end wine. I sounds like it's coming from the differential. I have posi. I checked the gear oil and it's good. This wine doesn't happen all the time. I want to think it's either the bearings in the axle or it's the bearings in the differential. If so which ones? This is a daily driver and I need it to get back and forth to work. I am hoping somone can help me out with the problem so I can get the parts ahead of time before I tear it apart. Any Ideas or similar problems?
Thank you for your support!

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91 CAMARO Z28
350 5.7 TPI (L98)
108,000 miles still stock and running strong!

 

Should have mentioned.....I do plan on upgrading my car i.e. engine, trans, etc. If I'm having the problem with the rear end what would be a wise decision as far as upgrading the rear end? Would still like to have decent gas mileage (like it matters with the gas prices anyhow) and still be able to take it to the track regularly and get decent times? I'm doing 14.3 at 98.54 (best time) right now.

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91 CAMARO Z28
350 5.7 TPI (L98)
108,000 miles still stock and running strong!