If you get a 2004 or 2005 without a warranty, then look out for the rear.But this whole rear-diff thing has me worried. I did just sell my 2001 Audi S4 in which I replaced the turbos... so it cant be worse... right? How much does it cost to fix this problem? Also, how much is a clutch job roughly?
The theory is that wheelhop causes rapidly cyclical, very high loading on the diff. If this occurs a number of times, a whining sound can develop coming from the diff especially under light acceleration in 6th gear from about 45 MPH up to about 55 MPH. Most cars have had the slightly upgraded '06/'07 diff (and axles) installed, but whining can still develop depending on severity of operation. The new DSS axles now being sold by a vendor here appear to virtually eliminate wheelhop and thus MAY be a preventative for the eventual development of diff whine. It must be noted that this last statement is currently being put to the test.... What is the diff issue? how expensive? any early symptoms? How will i know?