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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.
to install 31 spline axles, you need the axles (duh), new axle bearings, new axle seals, new 31 spline carrier, and a full re-installation for a gearset.
I always recommend holding off on installing gears if you plan on installing 31 spline axles in the future, and do it all at once.... Do it right, the first time!