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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.
DOWNS FORD makes a 23 tooth gear........only 1 to 2 mph out on my car....
if you had a clue you would know that HIS car has a 8 tooth drive gear in the tranny. A 23t gear (not a ford part btw) would only properly correct his speedo to 3.55 gears