You can not buy individual parts for the diff. Rebuilding the diff at a shop will cost you over 500$ . Go to your local salvage yard and pick up a new used diff.
3.64 gear is not a very common ratio so you would need to search a bit to get one.
Or ,for your automatic trans you could just upgrade to a more common ratio,which is 3.67 i believe ,from an x3
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Last edited by Blocked Out; 03-04-2013 at 09:47 PM.