2006 Kia Other

Noises problem
2006 Other Kia Models 4 cyl Four Wheel Drive Automatic 80,000 miles

My kia recently was making noises in the rear end it sounds like rubbing and at times like grinding. I was told that it was my rear differentals. Is it normal for this to go out in less than 5 yrs. Also approximately how much would something like this cost (parts and labor)?
March 20, 2010.

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