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Re-calibrating Speedometer for New Tires Sizes
Customer switched from P215/75R15 (86.5 inches circumference) to P225/60R15 (80.5 inches circumference) on 1998 Dodge truck RWL with AT. I calculate the impact to be about 5 mph. How can I correct the speedometer? In the PCM? Or do I find a new speedometer gea... Login to read more. 
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