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Unread 03-25-2004, 10:38 AM   #1
Builder15
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Speedometer Recalibration

If i am currently running stock 30" tires and get bigger tires, say 32" or 33" will I need to recalibrate the speedometer or is the percentage change too small to really need recalibration?

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Unread 03-25-2004, 10:43 AM   #2
BigWaylon
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Quote:
Originally Posted by Builder15
If i am currently running stock 30" tires and get bigger tires, say 32" or 33" will I need to recalibrate the speedometer or is the percentage change too small to really need recalibration?
yes and no...

you need to change the speedometer gear, not recalibrate the speedometer...it's a 5 minute job and will cost you $12-$20 depending on the gear...

it will be a small percentage off...but it's still off...and you might not worry about the speedometer, but it also effects the odometer, and that's a major legal issue...

here's the write-up:

http://www.4x4xplor.com/speedo.html

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Unread 03-25-2004, 11:17 AM   #3
Builder15
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So if i change the speedomoter gear then that will fix the problem with the odo?
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Unread 03-25-2004, 11:26 AM   #4
TJdave
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Quote:
Originally Posted by Builder15
So if i change the speedomoter gear then that will fix the problem with the odo?

It will fix your problem. I just changed mine recently and it was pretty easy.

Since i got 33's I was not racking up miles on my odeometer accurately and I figured i was off by about 11% on my speeodometer.
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Unread 03-25-2004, 11:45 AM   #5
Builder15
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Where can i pick one up, do you think they would have them at autozone or something like that? I'll check the 4 wheel parts near me but i didn't see them carrying it online.
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Unread 03-25-2004, 11:55 AM   #6
TJ Willy
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Quote:
Originally Posted by Builder15
Where can i pick one up, do you think they would have them at autozone or something like that? I'll check the 4 wheel parts near me but i didn't see them carrying it online.
Dealership is as good a place as any on those things...

This is how you determine part number you need:

Read here: http://www.simplyjeep.com/article.php?sid=3
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Unread 03-25-2004, 03:38 PM   #7
blupupher
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Quote:
Originally Posted by TJ Willy
Dealership is as good a place as any on those things...
Only place that is. Or that Jeep place online. No autoparts store carries them.
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