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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.
i would have to say it is the pulley, it can't be the same size
I just looked at the pulleys on the two alternators and the new one has a very small pulley. The one I took out has a larger pulley. I'm going to swap the pulleys and see if that makes a different.