Just thought I'd throw this up here incase someone want's to up/down size tires on their trucks. This is for a 2013 F150, I do not know if it's different for other year trucks but it's safe to say 2009-2014 will be covered by these sizes. You will have to do some measuring to compare if you opt for a size not listed to compare to the closest oem size for proper speedo and transmission operation, will also affect ABS and GPS.



Once you figure out what you wish to run, put em on and head to your local Ford dealer or a friend that has an IDS to take care of the programming.

If you have a non oem tuner then never mind.

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My question is how are many on here running a 6 inch lift with 35's and not mentioned any issues with CEL's? Is it because they re-calibrate the speedo and or run a tune? This is in reference to another thread mentioning issues with bigger tires.

 

Does this mean the dealership can recalibrate my truck to run 35x12.50. Or is better to just run a tune from SCT that allows to change to 35's. I didn't see in your post that 35's was an option from an IDS.

 

If I have an non oem tuner does that mean according to you I'm stuck with a check engine light?

 

According to Ford, yeah pretty much. The after market tuner is inputting parameters that are confusing the stock programming triggering the code that sets the light on.

When I last worked at the dealer I used to get it all the time with people running tuners, I would have them de-tune so I could figure out what was ailing their trucks and then they could re-tune after. That was on trucks/cars 10 years ago, todays electronics are a lot more sensitive.

My suggestion would be to find the largest or closest diameter tire to what you have in the list above and have them program it for that size, speedo, trans operation, ABS, PCM are all dependent on it for proper operation.

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Just read a post on here of a guy who has 13 Ecoboost 150 and used a Hypertech speedo calibration with 35's and reports all is normal. Maybe this will be my route. According to him he is dead on after verifying with his gps and getting 22 mpg at 70.

 

Used one on my 12 EB with 33.5 duratracs. Dead on.