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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
You stock axles are 28 spline...if you get a posi unit get a 28, but if you want to beef it all up, get 31 and new axles. I put in a cluch kit myself...no big deal. Cost me like 60 bucks for everything (lube, gasket, kit)