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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.
only way to eliminate the noise is to completely flush the system with synthetic p/s fluid, but it's really a hit or miss with a used rack & pinion.
even a brand new pump, or reman, will whine somewhat. probably less than your other, but you will not eliminate it without ^^^^^^^^^