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SPEEDOMETER CALIBRATION


 
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jojo
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Joined: 24 Jan 2005
Location: San Diego

PostPosted: Mon Jan 24, 2005 2:01 pm    Post subject: SPEEDOMETER CALIBRATION Reply with quote

I justed lifted and re-tired (33/12.50) my 04 Rubicon (4.0L Automatic) and my shift points are all messed up. I am looking for advice on how to correct. I found the Superflex Truspeed adapter by can't find any write-ups that talk about how it performs.
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ehirner
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Joined: 01 Jan 2004
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PostPosted: Mon Jan 24, 2005 2:30 pm    Post subject: Reply with quote

It's not the shift points...it's the larger circumference of the 33s compared to the smaller tires previously. Larger tires require lower gears for the same performance.

I know that's not the answer you wanted to hear, but it's the simple truth.
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quadna71
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PostPosted: Mon Jan 24, 2005 3:34 pm    Post subject: Reply with quote

yup, what he said. nothing will retrieve your lost power and correct your shift points 'cept for regearing or going back to stock-sized tires (heavens forbid!). if you are looking to just fix your speedometer to show the proper speeds on the road then a simple speedo gear swap will correct that. click here to determine which gear you need.
chris
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ThePhantum
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Joined: 23 Jan 2004
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PostPosted: Mon Jan 24, 2005 8:22 pm    Post subject: Reply with quote

I might be mistaken (wouldn't be the first time), but I believe the speedometer on the 04's are completly electronic now...so there's no speedo gear to swap.
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Code3TJ
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PostPosted: Tue Jan 25, 2005 12:00 am    Post subject: Reply with quote

Yeah, if it has the 241OG, I believe it needs to be recalibrated electronically.
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jojo
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Joined: 24 Jan 2005
Location: San Diego

PostPosted: Tue Jan 25, 2005 7:55 am    Post subject: Reply with quote

The electronic answer is what I keep coming up with, I know I can't make up the power loss with a calibration, my question is can I get the shift points straightened out. Thanks for the feedback.
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majikxms
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PostPosted: Tue Jan 25, 2005 10:54 am    Post subject: Reply with quote

Can you clarify what you mean by shift points?
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jojo
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Joined: 24 Jan 2005
Location: San Diego

PostPosted: Tue Jan 25, 2005 12:56 pm    Post subject: Reply with quote

The points (rpm's) that the transmission shifts at. It takes a lot longer to shift up and down with the new tires.
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ehirner
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PostPosted: Tue Jan 25, 2005 2:33 pm    Post subject: Reply with quote

thephantum wrote:
I might be mistaken (wouldn't be the first time), but I believe the speedometer on the 04's are completly electronic now...so there's no speedo gear to swap.

The speedo has been electronic for years. It's fed by the speedo gear in the tailshaft of the t-case on the 231s. It's still this way on the 04s. What you're mixing up is the 241 from a Rubicon. It does not use the speedo gear and can not be corrected by replacing a speedo gear.

With a 231 (i.e. non-Rubicon Wrangler), you simply need to replace the speedo gear with the one with the correct number of teeth to bring it back inline. This will make the speedo read correctly but it will not address the transmission's shifting. This is an issue of gearing.
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ThePhantum
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PostPosted: Tue Jan 25, 2005 7:09 pm    Post subject: Reply with quote

ehirner wrote:

The speedo has been electronic for years. It's fed by the speedo gear in the tailshaft of the t-case on the 231s. It's still this way on the 04s. What you're mixing up is the 241 from a Rubicon. It does not use the speedo gear and can not be corrected by replacing a speedo gear.


That's right. I just couldn't remember the exact details. Thanks E.
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