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    Rev Per Mile - Speedo Calibration

    I installed 265 75 16 on my 2000 with the stock size was 255 70 16 So I figured out with the Ford IDS Scan Tool that with my new size tire is 658 rev per mile and the stock was 290. I then used the NGS tool to program the PCM to the new rev per mile of 258. I am comparing my speedo to my...
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