Switching to a different gear ratio or taller tires tends to throw off your speedometer reading. Correct it with a 94-04 speedometer gear or speed corrector. Choose the right 6, 7, 17, 18, 19, 20, 21, and 23 tooth speedometer gear for your application. Each gear comes with a new Ford replacement retaining clip to keep it in place. Add a speedometer cable, grommet, or speed sensor to your order to get your SN-95 speedometer reading correctly to avoid costly tickets!