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Unread 09-17-2005, 08:32 PM   #1
Linda or Greg
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Speedometer Calibration

I just compared my speedometer to my GPS. When the speedometer says 60 - the GPS says 65. The work seems simply enough -http://www.4x4xplor.com/speedo.html - but somewhere I think I read that on an '05 TJ the fix is electronic and not mechanical. Anyone know for sure?

I'm driving a 6 speed, 6 cyl, 31s and a 373 rear end.

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Unread 09-17-2005, 09:12 PM   #2
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Quote:
Originally Posted by Linda
I just compared my speedometer to my GPS. When the speedometer says 60 - the GPS says 65. The work seems simply enough -http://www.4x4xplor.com/speedo.html - but somewhere I think I read that on an '05 TJ the fix is electronic and not mechanical. Anyone know for sure?

I'm driving a 6 speed, 6 cyl, 31s and a 373 rear end.
Only the Rubicon and Rubicon Unlimited are electronic. Any other TJ has speedo gears just like any other year TJ.
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Unread 09-17-2005, 09:32 PM   #3
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the dealer told me my 2005 wrangler x had electronic speedo and they had to reprogram computer when I put bigger tires on it.
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Unread 09-17-2005, 09:37 PM   #4
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Quote:
Originally Posted by slopoke101
the dealer told me my 2005 wrangler x had electronic speedo and they had to reprogram computer when I put bigger tires on it.
Interesting. Another user here had a '05 that had to be programmed but I think it is because he said he swapped transfer cases or something. He said that all other '05s are the same as prior TJs.
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Unread 09-17-2005, 09:59 PM   #5
slopoke101
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Quote:
Originally Posted by Rocky529
Interesting. Another user here had a '05 that had to be programmed but I think it is because he said he swapped transfer cases or something. He said that all other '05s are the same as prior TJs.
I must investigate this further.
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Unread 09-18-2005, 08:25 AM   #6
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Quote:
Originally Posted by slopoke101
the dealer told me my 2005 wrangler x had electronic speedo and they had to reprogram computer when I put bigger tires on it.
The dealer told me the same thing about my 05'. Fast forward a week, when I went to make an appt to get it done they changed their tune to "Oh we can't fix yours through the cpu". After I asked them how do I recal. my speedo they were at a loss, they swore I couldn't swap out the speedo gear. Basically telling me I was SOL.

I got the part number I needed from the speedo chart, when I went back to order it, the effin service guy tried to tell me it wouldn't fit because it was for a cherokee?! I had him order it for me any how ($9).

10 Minutes of work under the jeep and I was good to go. To make a long story short...The Jeep dealer here in Crestview, FL is full of morons, only Rubi's need to get hooked up to the computer, and you can fix your speedo for about 10 dollars and 10 minutes of work
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Unread 09-18-2005, 10:56 AM   #7
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Quote:
Originally Posted by cpash
The dealer told me the same thing about my 05'. Fast forward a week, when I went to make an appt to get it done they changed their tune to "Oh we can't fix yours through the cpu". After I asked them how do I recal. my speedo they were at a loss, they swore I couldn't swap out the speedo gear. Basically telling me I was SOL.

I got the part number I needed from the speedo chart, when I went back to order it, the effin service guy tried to tell me it wouldn't fit because it was for a cherokee?! I had him order it for me any how ($9).

10 Minutes of work under the jeep and I was good to go. To make a long story short...The Jeep dealer here in Crestview, FL is full of morons, only Rubi's need to get hooked up to the computer, and you can fix your speedo for about 10 dollars and 10 minutes of work
thank you, they wanted 101 bucks to reprogram.
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Unread 09-18-2005, 03:26 PM   #8
Linda or Greg
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I crawled under my jeep ('05) and pulled the speedometer gear out of the transfer case. Shoulda done that earlier. It is a mechanical fix. The gear was a 36 and I need a 33. I guess that's the problem. Now I have to go to the dealer - I hate that.
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Unread 09-18-2005, 06:52 PM   #9
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I have an 05 Unlimited and I just changed the gear - takes 5 minutes
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Unread 09-18-2005, 07:03 PM   #10
Linda or Greg
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My tires are 31s. They physically measure 30" high. I should use the 30" measurement in determining what gear to buy - right?
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Unread 09-19-2005, 07:09 PM   #11
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I bought the pinion gear based on the measured height of my tire - 30" - even though the tire is sized as a 31. I checked it against the GPS and it was exact. If I had installed the pinion gear for a 31, I would have still been off. It's tricky getting that gear out and not tearing the O ring.
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Unread 09-19-2005, 07:30 PM   #12
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my 2005 has a speedo gear in it im sure yours does to.
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Unread 09-19-2005, 07:43 PM   #13
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How do I know what R & P I have?
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Unread 09-19-2005, 07:48 PM   #14
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On my '05, it's on a metal tag attached to the rear diff. It starts off 3.73 followed by other numbers.
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Unread 09-22-2005, 03:37 PM   #15
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Quote:
Originally Posted by Linda
On my '05, it's on a metal tag attached to the rear diff. It starts off 3.73 followed by other numbers.
Can you post a pic of this? I think I know what you are talking about, but my tag is warn and its hard to know if I'm looking at the right numbers, thanks
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