What trans, Transfer case and axle do I have?
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The diff only needs a additive if you have the limited slip. You can get a build sheet from dodge that will tell you everything your truck came with. Takes about a day to come back by email
http://www.dodge.com/wccsapp/univers...ull&category=R
http://www.dodge.com/wccsapp/univers...ull&category=R