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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.
That's the most common source for an oil leak between the block and trans. But check to make sure you're not getting a valve cover leak, the oil can run down and seem like it's coming from a seal when it's not.