Is your 1979-93 Mustang speedometer off? Repair it with a brand new speed correction speedometer gear. Installing rear end gears or switching to a bigger tire usually throws your Fox Body speedometer off. Repair it with Late Model Restoration's 6, 7, 17, 18, 19, 20, 21, and 23 tooth drive gears and speedometer gears. Don't forget your speedometer cables, retaining clips, and sensors to get your speed gauges working correctly again.
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