Front diff on a 93 s4

[joel nevin <joelnevin@yahoo.com>]

This question is from a friend that I know that has a
1993 s4

The dealer has to change tth front diff on the car.
63,000 miles are on it, and it is making a whining
sound. Is there anything he has to watch out for. 

Is there a chance that they might us a non-s4 diff?
What about used?

Thanks
Joel Nevin
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