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Nissan Motorsports has some 4.60 gears for like 600 dollars any nissan dealer should be able to get them they have a couple of others but i don't have my mag with me right now sorry
one could always go with a good ol' Ford racing rear end or shop the mopar catalog. But I assume you are looking for a direct bolt in. In that case go with the Nismo. Courtesy Parts has a really good site.