Thread: Speedo/Odo correction
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Old Sun, April 5th, 2009, 12:19 AM
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Jackpine Jackpine is offline
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Quote:
Originally Posted by Sburn View Post
If your Gryphon matches your GPS, you're fine. Odo will also be correct. Your speedo will be 3% higher than your actual (GPS) speed because Ford set it that way.
Very good, Sburn! I hadn't thought of the speed difference in terms of percentages. That explains why it's only about 1 mph fast in the 40 mph range and is 2 mph fast in the 70 mph range.

And, back to the OP's question - yes! Programming the PCM with a new tire size set in the programmer DOES change the dashboard speedometer too. The PCM controls the speedometer readout in the new trucks.

- Jack
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