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My speedometer is off on my 2006 F150 FX4 with a 5.4L 3

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valve engine. I corrected it...
My speedometer is off on my 2006 F150 FX4 with a 5.4L 3 valve engine. I corrected it with a BullyDog programmer but I'm wondering what size tires I could use and not need a correction. Current tires are 275/65R17 and truck door sticker calls for 275/65R18 tires. The standard size should be 31.1" and I have to tell the BullyDog that the tires are 29" go get the speedometer to read correctly. I believe the rear end may have been swapped out a while back so not sure what size tires would make it read correctly without any correction. Ideas?
Submitted: 7 months ago.Category: Ford
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Answered in 5 minutes by:
12/20/2017
Ford Mechanic: Chris (aka- Moose), Technician replied 7 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
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Are you needing to first off check and see what rear axle ratio is in the vehicle?

When running the correct tires the truck calls for and without adjusting the speedometer reading, how much off is it?

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