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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.
If you read your owners manual (it should be in there), if you hold the off button on your cruise control for 3 seconds or more it disables the speed limiter. Found this on my buddies 93 LX 5.0, it was in his owners manual. We were racing on the E-way and he said that his car "cut out" at like 120-130. Read the manual and it was in there.
-P.