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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.
If that is one of your few mods, not worth it. You won't feel any torque increase replacing the driveshaft. You would be better off saving for a power adder ie h/c/i etc.