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Old 03-10-2009, 08:16 PM   #1
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Tire mods and speedo

I am changing tires from factory 225s to 265 bf goodrichs. Will that affect my speedo? If it affects the speedo, will it cause the speed sensor to change the shifting pattern at different RPM's?

Thanks

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Old 03-11-2009, 01:03 PM   #2
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225 and 265 are talking about the width of the tire. the 75 or the 70 is the sidewall or the hieght of the tire. the stock tire is a 75 and your new bfgs are also a 75 so the hieght of the two tires will not be different enough to change your speedo. i think stock they are like a 30 inch tire and the bfgs are a little bigger than a 31 inch so not much difference

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Old 03-11-2009, 07:31 PM   #3
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duplicate post, read my answer in the other thread.
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Old 03-11-2009, 07:46 PM   #4
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I should have been more specific. I am going from factory 225/75/16's to
265/70/17's. A substantial change in circumference. How do I make adjustments to the auto trans. and shift patterns? Any idesa would be great.
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Old 03-11-2009, 09:41 PM   #5
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I once new of a place around here that would recalibrate a speedometer. That was many years ago. Wouldn't even know how to look that one up. I did google that and got this site if you are into do it yourself speedometer adjustment. I also got some transmission type companies. My guess would be either the dealer could do it or a transmission place could do it if you don't want to do it yourself.
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Old 03-13-2009, 02:02 PM   #6
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Use this:
American Expedition Vehicles - Wrangler ProCal Module - Additional Vehicle Features and Calibration Tool

AEV's ProCal Module is a hand-held powerhouse! This essential tool provides JK owners an easy, low-cost way to make a variety of useful changes not offered by the dealer or any other re-programmer. Topping the list is the ability to correct the speedometer and gear ratio when larger tires are installed. With the speedometer left uncorrected, there is a major degradation in the performance of the stability control (ESP), transmission shifting, and engine performance.

The best part of the ProCal is that it isnít just for correcting the speedometer. The Tire Pressure Monitoring System can now be recalibrated to better suit aftermarket tires without triggering the dash light. Further, the ProCal Module makes it possible to activate daytime running lamps, "one-touch" turn signals, enable a temporarily increased engine idle speed for winching, clear engine codes, and even has a feature to help align the vehicle perfectly for optimal ESP performance.

The ProCal Module is equipped with a series of easy-to-use DIP switches. By reading the simple Quick Reference Guide included with the ProCal module, a user can quickly dial in a code for the desired recalibration. Once the DIP switches are set, simply plug the Module into the vehicle's OBDII. The whole process can be completed in mere minutes and it's just as easy to restore the vehicle back to its original settings with the ProCal.


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Old 03-16-2009, 11:40 AM   #7
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Quote:
Originally Posted by Wrangler elvis View Post
I should have been more specific. I am going from factory 225/75/16's to
265/70/17's. A substantial change in circumference. How do I make adjustments to the auto trans. and shift patterns? Any idesa would be great.
Quote:
Originally Posted by jk'n View Post
I once new of a place around here that would recalibrate a speedometer. That was many years ago. Wouldn't even know how to look that one up. I did google that and got this site if you are into do it yourself speedometer adjustment. I also got some transmission type companies. My guess would be either the dealer could do it or a transmission place could do it if you don't want to do it yourself.
Speedo calibration is all electronic (like everything else in these JK's) and is accomplished by ICU re-program.

Mine was done by the dealer for no charge. (standard price was $40 but they waived it)
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Old 03-17-2009, 09:28 PM   #8
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check your local jeep dealer. They can hook you up.

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