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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.
don't change the alt pulley for an underdrive... but if you must know, it takes a special tool, i rented it out at my local part store to change them (didn't do the alternator though).
wait i just realized since i never took off the alt pulley, i don't even know if it's pressed in like the P/S pump pulley, disregard my post untill someone else chimes in.