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Get the cobra diff and either moser or strange axles. The cobra diff is stout and easily/cheaply rebuildable when the time comes and the moser and strange axles are another tried and true product. That motive company may have a 10 year warranty, but like Chris Farley said in Tommy boy a guarantee is only as good as the guy who wrote it. I don't know much or heard much about that company. Hence I'd stay away. Just my. 02