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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.
Did you put in a different speedometer gear when you put the 3.73's in? If your speedometer is off your odometer will be off too.
Even with a correction gear the reading wont be perfect though.
Yeah, I am not sure if the speedo gear was changed, the speedo cluster was done two weeks ago. I guess I should change the gear outshortly as well. It's cheap, why not