Computer Update for 18" to 20" Wheels? - Ford Powerstroke Diesel Forum
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Old 12-11-2012, 06:36 AM
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Computer Update for 18" to 20" Wheels?

I think I know the answer to this but I wanted to know if I got a truck with the 18" wheels and I bought some 20" King Ranch wheels from someone, I should be able to take the truck to Ford and they can recalibrate the computer for the larger wheels, correct? Similar to what they do for the fuel tank...

I am thinking about doing this to cut down on the costs of the truck (not having to add the 3.55 gears and 20 in wheels for roughly $1500)
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Old 12-11-2012, 10:12 AM
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Interested as well. My truck came with the factory 17's and I swapped to the 20" Lariat wheels with the taller factory tires. My speedo is off pretty bad so I'm sure it's throwing off my mileage calculations as well as my fuel milage calculations.
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Old 12-15-2012, 09:09 AM
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Bump

Bump? Anybody has anything on this?
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Old 12-15-2012, 09:23 AM
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recalibrate

Yes they can. I had 18's on one truck and put 20's and the recal. for me.
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Old 12-15-2012, 02:07 PM
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Quote:
Originally Posted by TX_TRU_STUD View Post
I think I know the answer to this but I wanted to know if I got a truck with the 18" wheels and I bought some 20" King Ranch wheels from someone, I should be able to take the truck to Ford and they can recalibrate the computer for the larger wheels, correct? Similar to what they do for the fuel tank...

I am thinking about doing this to cut down on the costs of the truck (not having to add the 3.55 gears and 20 in wheels for roughly $1500)
I did it yesterday on my 2011. thought it would be free... they charged me $35. I stuck with my same 18" wheels, but put larger tires on them.
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Old 12-17-2012, 06:41 AM
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Would you happen to know how they went about doing it? I called the dealership where I bought mine and they said it can't be done. Brought the truck to another dealership and they told me it couldn't be done and that doing so was a legal liability. Not sure wtf that's about.
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Old 12-17-2012, 07:11 AM
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larger tires

They do it through the computer system, I had mine done with no problem.
The only legal problem with it is when a manufacture sumits a car or truck for EPA testing each vechel (sp) is sumitted with a certain setup such as engine, trans and rearend ratios. It is against EPA regulations to change anything related to EPA regulations. Call around to other dealerships till you fine one.
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