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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.
my tri ax did that and I think it's a combonation of gears and the drive shaft. I put in an aluminum d/s and it quietted it down quite a bit. It still rattles a little though.