Needed for all pre-99 Mustangs to get correct speedometer reading with 3.73/4.10 Ring Gear and Pinion change. Click on the article link to see how easy this project is! Speedometer Recalibration after Ring & Pinion Gear Ratio Change (Posted: 3-10-2008) Free USPS First Class shipping in all 50 states! Usually ships the next business day. 23Tooth $23.99CHiP'S V6 Price: $19.46

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