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Author Topic: speedo is out 20km hr  (Read 917 times)

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rolandjc

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speedo is out 20km hr
« on: February 27, 2010, 03:16:41 PM »
hi guys please bare with me as i am new to owning a jeep and i may get some things wrong.
when i bought this J and brought it home i noticed that my speedo was out about 20km. so i think the gearing has been changed to be out this far. my question is on a jeep how can this be corrected. thanks for your help in advance
rolandjc
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Offline apex

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Re: speedo is out 20km hr
« Reply #1 on: February 27, 2010, 03:37:52 PM »
speedo gear is an easy swap. It's on the t-case and pretty straight forward.

Does it have larger than stock tires?
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rolandjc

  • Guest
Re: speedo is out 20km hr
« Reply #2 on: February 27, 2010, 03:57:08 PM »
on the door it suppose to have 205's but it has 215s on it
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Offline apex

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Re: speedo is out 20km hr
« Reply #3 on: February 27, 2010, 04:50:18 PM »
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Offline Tagg

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Re: speedo is out 20km hr
« Reply #4 on: February 27, 2010, 09:56:13 PM »
depending on the year of the jeep an AEV Procal module can adjust it to dead on.
It took me a couple of tries but mine is now exactly on my gps reading
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Offline Evil-Jeep

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Re: speedo is out 20km hr
« Reply #5 on: March 04, 2010, 12:06:48 AM »
As a general rule of thumb for every 10% increase in tire size your speedo should read 10% slower..... for every 10% increase in gear ratio your speedo should read 10% faster. it is however a rather inexpensive and easy fix.
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