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Speedo Calibration Who does speedometer calibration?

#1 User is offline   drshame 

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Posted 22 October 2011 - 09:04 AM

My Speedometer is off by about 6 mph after installing lift/bigger tires.
What do I need to do in my 03 WJ to get the speedometer adjusted?
My dealer tried re-calibrating it with their ODB scanner...but the factory tire size-setting was still wrong.
I don;t really wanna spend $300 for an advanced tuner/scanner not knowing if it'll work or not.
Are there any speedo-Jeep shops in South Dade that can reset it?

#2 User is offline   SeaMonkey 

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Posted 24 October 2011 - 11:57 AM

If it's anything like a TJ, you just need to change the speedo gear. It's like $70.
- 2000 TJ with big rubbery tires for going on trails and stuff.

#3 User is offline   92SquareEye 

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Posted 25 October 2011 - 08:41 AM

Just match your tire size to your gear ratio and get the correct tooth speedo gear...this is an easy swap.

:click:

-dave

#4 User is offline   Coneal30 

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Posted 11 January 2012 - 11:56 PM

i have the same problem. i have a 1990 YJ and a mechanical speedo and recently upgraded to 4:88 (wish i had gone with 4:56) gears and 35" tires and my speedo is off by about 9.5 mph. i ordered the 39 tooth gear from JC Whitney for $48 including shipping. when it gets here ill let you know how the install goes

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