93-98 cars had the Auburn limited slip differential, 99-02 had a Torsen posi. The Auburn has clutches that can wear out and are not rebuildable, the Torsen doesn't have wear parts but can fail mechanically. Pick your poison. If you plan lots of power in the future spend the money for a 9", if not find a 3.23 or 3.42 ten bolt, and if possible try to find one with verifiable low miles. You might also be able to find a posi unit by itself for sale, I've seen them come up on eBay occasionally.
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