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Old 08-25-2014, 01:53 AM   #1
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Installing NV241OR/NV241HD transfer case in non-Rubicon

In order to install the NV241OR/HD transfer case (a.k.a. Rubicon transfer case) into a non-Rubicon JK, is there a need for a dealer to reflash the ECU, or is this purely a mechanical install?

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Old 08-25-2014, 02:37 AM   #2
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The PCM/ECU has a hand in managing the drivetrain on and off road, so it is almost a certainty that it must be aware of the different transfer case gearing.

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Old 08-25-2014, 06:48 AM   #3
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Originally Posted by H3br3whamm3r81 View Post
In order to install the NV241OR/HD transfer case (a.k.a. Rubicon transfer case) into a non-Rubicon JK, is there a need for a dealer to reflash the ECU, or is this purely a mechanical install?
No problem except later models 2012+....auto and manual bolt up are different from what I understand. So, if you have 2012+ with auto, the donor must also be a 2012+ auto. But the ECU needs nothing.
On my 2010, it was a direct swap, couple hours and done!!
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Old 08-25-2014, 11:13 AM   #4
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No problem except later models 2012+....auto and manual bolt up are different from what I understand. So, if you have 2012+ with auto, the donor must also be a 2012+ auto. But the ECU needs nothing.
On my 2010, it was a direct swap, couple hours and done!!
This is good to know. One of the many future MODs I want to do.

Thanks OP andJEEPDON for posting this one
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Old 08-25-2014, 03:56 PM   #5
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Pretty sure on 2012+ you need to flash as well, I think the ProCal and FlashCal can handle this.
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Old 08-25-2014, 05:08 PM   #6
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The newer models need the flash. The 3.8L 42RLE combination does not. The Procal has no provision for it. And only the latest FlashPac has the capability. This was covered on another forum pretty extensively. I will see if I can find it.

Bob K.
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Old 08-25-2014, 11:51 PM   #7
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Thanks all! Please add any more relevant info if you come across it.
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Old 08-26-2014, 11:34 AM   #8
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I did some research on this a while back also. I believe the 2012+ auto transfer case can only mate up to another 2012 + auto. On the other hand, a 2012 + manual transfer case can mate to a 2012 + manual and to pre 2012 transfer cases. The only thing a 2012 + manual can't mate to is a 2012 + automatic transfer case. You will also need to flash the computer with a Flashpaq to change the gear ratio. This is necessary for the auto with its shift points. You could probably get by without flashing the manual, but with BLD and ABS, I wouldn't chance it if you already own a Flashpaq.
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Old 08-26-2014, 11:53 AM   #9
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The 2012+ computer uses the output of the speed sensor (in the tail shaft of the transfer case) to know when to shift the automatic. When you change the transfer case gearing, that affects the speed of the transmission in low range. If you don't reflash the computer when you swap low range, you will confuse the computer. You must reflash the computer to tell it what low range you're running.

The manual transmission does not have this limitation because the computer isn't controlling the transmission. Nor does the 2007-2011 automatic because the system is entirely different.

Because of the computer managing the 2012+ transmission, you can't put a 3 or 4 speed transfer case in at all. But, again because the computer doesn't control it, you can put one in a manual equipped 2012+ Wrangler.
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Old 08-28-2014, 06:20 PM   #10
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The 2012+ computer uses the output of the speed sensor (in the tail shaft of the transfer case) to know when to shift the automatic. When you change the transfer case gearing, that affects the speed of the transmission in low range. If you don't reflash the computer when you swap low range, you will confuse the computer. You must reflash the computer to tell it what low range you're running.

The manual transmission does not have this limitation because the computer isn't controlling the transmission. Nor does the 2007-2011 automatic because the system is entirely different.

Because of the computer managing the 2012+ transmission, you can't put a 3 or 4 speed transfer case in at all. But, again because the computer doesn't control it, you can put one in a manual equipped 2012+ Wrangler.
'Nother advantage of having a manual!!!!!
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Old 08-29-2014, 06:23 AM   #11
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The newer models need the flash. The 3.8L 42RLE combination does not. The Procal has no provision for it. And only the latest FlashPac has the capability. This was covered on another forum pretty extensively. I will see if I can find it.

Bob K.
AEV procal will flash it on 12 and newer. from their website and they told me that in person as well.

AEV's ProCal Module now features an all-new Transfer Case Calibration function that allows customers to install a non-stock transfer case into their 2012+ JK Wrangler (w/ A580 trans) without causing the vehicle to go into limp mode. This includes 2-speed Atlas transfer cases as well as Chrysler's Command-Trac NV241 (Sport/Sahara) and Rock-Trac NV241 (Rubicon) transfer cases.This new feature is only found on the latest version of the ProCal Module (part number 30406007AG). As of 2/18, all ProCal Modules being shipped from AEV are the latest version and include this function.
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Old 08-29-2014, 08:12 AM   #12
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Nice! And the part number for the win. Thanks for that.


Bob K.

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