04 TJ Auto Trans Shift Points - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-24-2005, 10:57 AM
jojo
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04 TJ Auto Trans Shift Points

Just got done installing RE 4.5 Lift and 33x12.50's on my 04 Rubicon. Auto Transmission shift points are all messed up. Is there a way to adjust the shift points to match new ratios?
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post #2 of (permalink) Old 01-24-2005, 12:35 PM
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Re: 04 TJ Auto Trans Shift Points

Sounds like you need to have your speed sensor recalibrated.
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post #3 of (permalink) Old 01-24-2005, 04:06 PM
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Re: 04 TJ Auto Trans Shift Points

My dealer sent me down the road to a spcialty shop and they told me I would need to have my computer reprogramed or buy an in-line adapter. So far the only one I have come across it the Superflex Truespeed.
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post #4 of (permalink) Old 01-24-2005, 04:20 PM
 
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Re: 04 TJ Auto Trans Shift Points

Cant you just replace speedo gears like all the older YJs and CJs?
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post #5 of (permalink) Old 01-24-2005, 08:03 PM
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Re: 04 TJ Auto Trans Shift Points

Nope, it's a magnetic pick-up and my understanding is that it must be electronicly adjusted.
post #6 of (permalink) Old 01-25-2005, 11:59 AM
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Re: 04 TJ Auto Trans Shift Points

[ QUOTE ]
Just got done installing RE 4.5 Lift and 33x12.50's on my 04 Rubicon. Auto Transmission shift points are all messed up. Is there a way to adjust the shift points to match new ratios?

[/ QUOTE ]

You need to reset the computer so it can relearn the shift points to compensate for your new tires. If your speedometer is reading correctly, you don't need to have the computer reprogrammed or get the inline corrector. Most Rubicons seem to be calibrated better for 33's than the stock 31's, so you shouldn't need to worry about the speedo.

Here's a link to the procedure for resetting the computer: Rubicon Owners Forum - Fast Learn reset procedure

There's a lot of other good info out there at the Rubicon Owners Forum board.

If this procedure doesn't clear things out, have the dealer check for updated TCM (transmission control module) software.

-Howard
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