Two of the most popular modifications for mustangs is to change the ring and pinion ratio and/or change wheels/tires. Especially for drag racing, to optimize gear/wheel/tire setup for the best ET. Please provide a way for dealer technicians to correct the speedometer after a gear swap, wheel or tire change. Or maybe offer a Pro-Cal tool (or something similar) that keeps the factory engine calibration yet allows the customer to modify gear ratio, wheel/tire combo. I would purchase this in a heartbeat.
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