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Need help! Dealership doesn't know how to change tire size

draffind

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Does anyone know what module or where in the tuner the tech has to go to change the tire size? I have my jeep at the dealership now and they don't know where to set for 37's? Any ideas?
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1quick1

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The way it was explained to me is they do a "service contract" through Mopar that involves some paper work then they flash it. Don't ask me, it didn't make sense to me either BUT they were able to do it in a few hours.

I had them do mine to 34.5" tires. It is pretty much right on. At most 1/4mph off as every now and then very briefly I can see the GPS and speedo be different 1mph but you can tell it's so close as just the slightest throttle lines them right back up.

Also my tranny will shift into 8th gear again. When it was on the stock programming for Sport wheels 8th went away.
 

Harley

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So i went into Chrysler/mopar dealer today for my appointment to change tire size to the 315’s I have. They said they’ve done it multiple times. When I went to pick it up they told me they couldn’t do it because “Chrysler has pulled the ability to change tire size for the JL”. Is this complete bs or is this correct??? Could a moderator please chime in on this as well? Thanks
 

johnparjr

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Unless someone here works for Jeep the moderator wouldn’t know and I would say your Jeep dealer is probably wrong. Go buy a tazer or flashcal and do it yourself that’s what I did and it’s super easy
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