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Old 05-07-2006, 08:11 PM   #1
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Odometer Issues

Recently bought a used '04 Rubicon. After driving a few hundred miles I noticed that the odometer was running too fast - 4% to be exact. Upon doing a quick web search I found that this is a common occurence among Jeeps and many other Chrysler cars and trucks.

Has anyone had this problem resolved by a Jeep dealer or Chrysler itself? If so, what did they do? (Reprogram the computer? Extend the 36,000 mile warranty by a certain amount?)

I've been to a dealer once, and they told me that my Jeep's computer couldn't be reprogrammed as the vehicle did not have ABS. Said that only Jeeps with ABS can have have different tire sizes and gear ratios programmed into the on-board computer. Anyone know if this is indeed true, or just BS?

Any comments / advice would be much appreciated. Thanks,

Ed Durbeck

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Old 05-07-2006, 10:06 PM   #2
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depending on your tire size, your speed and odo can be off. it is a simple fix by changing the speedo gear to be correct with the tire size you have. there's a chart somewhere for the number of teeth your gear should have depending on the variables. maybe someone has a link for that.....

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Old 05-08-2006, 04:18 AM   #3
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Old 05-08-2006, 06:54 AM   #4
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The gear change is quick and painless.
With 33's my speedo is now knats *ss accurate, and linear, verified by portable electronic speed signs.
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Old 05-08-2006, 04:14 PM   #5
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Yeah, that's all well and good, but I've never heard of one running fast. Bigger tires only cause them to run slower. My TJ with 3.73's and 35's runs about 12% lower than stock if I remember rightly.
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Old 05-08-2006, 04:43 PM   #6
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Jack, being his Rubicon was purchased used, the same math for running larger tires could be applied to deep gearing and a little smaller tire.
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Old 05-08-2006, 10:15 PM   #7
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Hey guys, Rubi's dont have speedo gears. They need to be re-calibrated either through the use of a Superlift Tru-speed or some other programmer that lets you program tire sizes (hypertech) It's true that the dealer cant reprogram it, The DRBIII wont let you do it, because in DC's mind there should be no need for it, Rubis only came with ONE tire size/ gear ratio unlike all other Jeeps.

Quote:
Originally Posted by khenderson
depending on your tire size, your speed and odo can be off. it is a simple fix by changing the speedo gear to be correct with the tire size you have. there's a chart somewhere for the number of teeth your gear should have depending on the variables. maybe someone has a link for that.....
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Old 05-08-2006, 10:16 PM   #8
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.....And YOU TOO will also need a Superlift TRU-SPEED to correct yours now with the Extreme Short shaft kit......


Quote:
Originally Posted by 1BLKJP
Yeah, that's all well and good, but I've never heard of one running fast. Bigger tires only cause them to run slower. My TJ with 3.73's and 35's runs about 12% lower than stock if I remember rightly.
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00 TJ, RockKrawler Pro 8 Coil-Over Stretch Kit (104") and some other "stuff"....
07 JK Rubicon 2 Door, RockKrawler 5.5" Long Arm "X" Factor lift kit, 5.13 Gears, AO Emissions canister skidplate, 1310 U-jointed driveshafts, 37" Mickey Thompson Baja Claw tires on Walker Evans beadlocks, ORF Front bumper, Olympic Rock sliders, Alloy USA front Cro-mo shafts
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Old 05-09-2006, 05:35 PM   #9
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Quote:
Originally Posted by Absolute Offroad
.....And YOU TOO will also need a Superlift TRU-SPEED to correct yours now with the Extreme Short shaft kit......
Oh, I know I need it there Mr. Jones. Just like a c note I don't feel like spending right now.
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Old 05-09-2006, 08:29 PM   #10
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Nice to see all the response since I posted a couple of days ago. By the way, I should have initially mentioned that the Rubicon does have the original stock (31") tires, those Goodyear MTR's. Also, I checked my odometer against a GPS unit several times and the result was always the same, with the odometer running 4% too fast.

So, with recalibration not being possible with the Rubi's, any ideas regarding possible alternatives? I'm still under the BtB warranty, which states that if anything doesn't properly function it's to be repaired at Chysler's cost. But, what could actually be the source of the problem here, and thus be a candidate for repair? I can only think of the Vehicle Speed Sensor (as the odometer system is 100% electronic). Any other ideas?

For a regular car, I probably wouldn't care about this, but when doing an off-road trail and the description says to turn right at 7.8 miles, etc an accurate odometer is important. Also, with a fast odometer, the warranty expires prematurely and depreciation is accelerated (a bit).

Does anyone know of someone who's dealt with Chrysler regarding an odometer issue amd how it turned out? Again, many thanks for all the responses.

Ed Durbeck
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Old 05-10-2006, 11:49 PM   #11
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ED, I think you would be fighting a losing battle with this one. It would just waste your time. There is nothing that DC can do to correct it, and 4% (remember that GPS units also have what is called "selective availability" which is a built in error amount and are not EXACT by ANY means) really is NOT that much. If it really bothers you, I would suggest a Superlift Tru-Speed, then you can make it SLOWER and make your warranty longer. That alone would justify the cost. As for trail running, you will have the GPS with you anyways, I suggest using that for milage recording....

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ASE Master L1 Certified since '96
00 TJ, RockKrawler Pro 8 Coil-Over Stretch Kit (104") and some other "stuff"....
07 JK Rubicon 2 Door, RockKrawler 5.5" Long Arm "X" Factor lift kit, 5.13 Gears, AO Emissions canister skidplate, 1310 U-jointed driveshafts, 37" Mickey Thompson Baja Claw tires on Walker Evans beadlocks, ORF Front bumper, Olympic Rock sliders, Alloy USA front Cro-mo shafts
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