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Someone told me that with the manual transmission, you can't electronically calibrate for tires size change, you have to get the proper small plastic gear and insert it into the transmission. Supposedly a 5 minute job.

I ask because mine was calibrated at the dealer, but the speedometer is still off by about the ratio of the tire size change.

So did the calibration not get saved right, or does it really need a mechanical part?
 

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not sure before the 12 version but after 12 you have to do it electronically.. before that I bet is the same.. I think the TJ is the last series that uses a gear change
 

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Your 2015 Jeep Wrangler Unlimited will require electronic calibration.
 
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