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  1. Which diff should I use for my blazer? Help!

    Transmission & Rearend
    I have reason to believe that the diff on my 2wd 2dr 5 speed blazer is on its way out. I want to replace it and upgrade it with a junkyard posi diff so I can start doing full burnouts instead of one-wheel-peels, but I've heard that 4wd posi rear ends wont fit on a 2wd.. Is this true? Which...