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Old 07-29-2010, 08:41 AM   #1
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Speedo calibration for JK???

I hate to post this 'cause it seems to be all over the other sections.

For an 09 Unlimited X would I be looking at a speedo gear or a box to adjust the calibration?

I've got 33's with 17" rims and I know it's off by at least 10%.

Not sure on the axle, any visual way to tell?

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Old 07-29-2010, 08:48 AM   #2
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Look at the rear pumpkin, at about the 10 o'clock position there's a metal tag, the last 3#'s embossed on the tag are your gears. Have you run with a GPS to verify how far your speedo is off? All you really need to do is verify how far off it is and add. But someone will pipe up with how to correct it on a JK. I am not that familiar with them to say for sure if it's a gear or not. I do believe you can correct it with a programmer up to a certain tire size, iirc.

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Old 07-29-2010, 09:03 AM   #3
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Wife used her GPS on a road trip she took and verified.

No tags on the pumpkin. There was a label on one of the axle shafts that had p/n 2012135-1.

Dealer made the mods after they acquired from Enterprise. It appears the driveshafts and axles are not original.

I get paid mileage for work and I could assume that if the speedo is off by 10%, the odometer must be off by 10%.
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Old 07-29-2010, 09:09 AM   #4
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Yes if the speedo is off, the odo is off as well. Take a pic of the rear diff, and post it up and we can at least verify that it's a D44... which it should be on a JK, iirc. Seems odd that the dealer would swap DS and axles... In any case a programmer should fix you right up. Search around the JK section for programmers and you'll find the most popular ones. Seems like if they regeared it (expensive) they'd have calibrated the speedo too....
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Old 07-29-2010, 09:26 AM   #5
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Quote:
Originally Posted by mariner09 View Post
Wife used her GPS on a road trip she took and verified.

No tags on the pumpkin. There was a label on one of the axle shafts that had p/n 2012135-1.

Dealer made the mods after they acquired from Enterprise. It appears the driveshafts and axles are not original.

I get paid mileage for work and I could assume that if the speedo is off by 10%, the odometer must be off by 10%.
That doesn't mean a change in driveshafts and axles. Something as simple as adding larger (or smaller) tires can make the difference.
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Old 07-29-2010, 09:34 AM   #6
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If you put on 33" tires, your speedo is off somewhere between 2/4%

I've used the AEV Procal Module and it corrects the speedometer, you have to measure the tires EXACTLY, to set the module for rolling circumference--easy to do

The modules are $149 and do a WHOLE BUNCH of OTHER THINGS TOO

Checkemout

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Old 07-29-2010, 11:35 AM   #7
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Like I said, the dealer did all the mods before I even saw it. Just bought it 3 weeks ago.

The GPS verified at 60 on the speedo, it was really going 66. Measuring the tires as I did and comparing to stock told me that the difference was 10%.
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Old 07-29-2010, 11:42 AM   #8
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Here's some pics, rear pumpkin and driveshaft.

I do love this iPhone app, BTW.
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Old 07-29-2010, 12:17 PM   #9
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Looks like a stock diff, and DS to me. I bet if you clean the gear fluid off the pumpkin at the top left you'll find the tag.... It's not easy, I needed a flashlight and magnafying glass to read mine, but I'm blind... Probably has 3:73 gears. As mentioned, a programmer should be able to adjust for the tire size...
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Old 07-29-2010, 03:06 PM   #10
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Talked to the dealer and it is all stock except for the tires, rims and lift kit.

Guess I'll be adding in my head until I get one of the calibrators. don't want to go too long with incorrect odometer, or do I...

Warranty good to 80k miles so I could actually get 88k miles out of it...

Hhmmmmm...
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Old 07-29-2010, 06:52 PM   #11
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Bingo Tires; Lift kit Get the PRO CAL from AEV
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Old 07-29-2010, 07:04 PM   #12
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you can buy the pro cal or the super chip. i have the pro cal and it works great. with the super chip you can also tune the motor, transmission for more power.
Northridge4x4 Jeep Parts: Chips & Programmers

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