Quote:
Originally Posted by Sburn
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.
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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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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
Sun, April 5th, 2009, 12:19 AM
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