Do you have any idea what or where the noise is coming from? Are you sure it is the differential? The worst case I would estimate around 1000.00 if it needs rebuilt. However, there are so many of them in the salvage yards as a result of the cash for clunkers, you could most likely find the entire thing the a couple hundred and then pay someone the same to install it.
NOTE: If you choose to do that, make sure to get the same gear ratio. You CAN NOT mix ratios with a 4x4.
Let me know if you have other questions.
Joe
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Friday, February 5th, 2010 AT 4:40 PM