Rubicon 4:1 transfer case swap into a sport question - JeepForum.com
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post #1 of 61 Old 12-12-2012, 07:34 PM Thread Starter
David_M
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Rubicon 4:1 transfer case swap into a sport question

I plan to swap in a rubicon 4:1 transfer case into a 2013 JKU sport with an auto transmission. I have two questions. First, is there a difference between the transfer cases out of the standard 6 speeds and the auto transmissions? I heard the input shaft was different between the two. Second, will the computer need to be programmed to compensate for the swap? I heard the PCM might go into limp mode in 4 low due to the new gear ratio? For those who have done this swap, I would appreciate a first hand account of any issues that may have come up.

Thanks, David M

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post #2 of 61 Old 12-12-2012, 08:02 PM
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From what ive read the swap is direct and you wont need to program anything, but hopefully someone with first hand knowledge will chime in.

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post #3 of 61 Old 12-12-2012, 08:37 PM
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Yes, direct swap...did mine in about 4 hours by myself.

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post #4 of 61 Old 12-12-2012, 09:54 PM
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Starting in 12' with the 5 speed auto the transfer case is on it's own; it will not interchange with the 6 speed manual from a 12'+ or earlier JK's.

The low gear ratio is embedded in the software for 4 low, it is not easy to program without the proper equipment.

We are doing an LS swap on a 12' right now but from experience there is not a problem with the 11' or earlier JK's installing the 4:1 OR TC.

The transfer case range sensor tells the TIPM when it is in 4 low so ESP functions are disabled. I have seen TIPM codes get thrown in regards to the transfer case but nothing that caused the PCM to go into limp.

The JK does get it's vehicle speed from the ABS module and the system does the math to compute vehicle speed when in 4 low based on the programmed ratio.

I'm sorry I don't know how the 12-13' PCM reacts yet since we have the luxury of dumbing down the Chrysler system so it can do no more harm and operate off the GM LS computer

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post #5 of 61 Old 12-12-2012, 11:16 PM
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Keep us updated if you do the swap!
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post #6 of 61 Old 12-13-2012, 06:10 AM
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Quote:
Originally Posted by VEGASROBBI View Post
Starting in 12' with the 5 speed auto the transfer case is on it's own; it will not interchange with the 6 speed manual from a 12'+ or earlier JK's.

The low gear ratio is embedded in the software for 4 low, it is not easy to program without the proper equipment.

We are doing an LS swap on a 12' right now but from experience there is not a problem with the 11' or earlier JK's installing the 4:1 OR TC.

The transfer case range sensor tells the TIPM when it is in 4 low so ESP functions are disabled. I have seen TIPM codes get thrown in regards to the transfer case but nothing that caused the PCM to go into limp.

The JK does get it's vehicle speed from the ABS module and the system does the math to compute vehicle speed when in 4 low based on the programmed ratio.

I'm sorry I don't know how the 12-13' PCM reacts yet since we have the luxury of dumbing down the Chrysler system so it can do no more harm and operate off the GM LS computer

Good info right there.

2012 2Dr JK - Metalcloak - Currie - Prorock - ARB - Poison Spyder - RCV - Synergy - Etc...
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post #7 of 61 Old 12-13-2012, 07:40 AM Thread Starter
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Quote:
Originally Posted by VEGASROBBI View Post
Starting in 12' with the 5 speed auto the transfer case is on it's own; it will not interchange with the 6 speed manual from a 12'+ or earlier JK's.

The low gear ratio is embedded in the software for 4 low, it is not easy to program without the proper equipment.

We are doing an LS swap on a 12' right now but from experience there is not a problem with the 11' or earlier JK's installing the 4:1 OR TC.

The transfer case range sensor tells the TIPM when it is in 4 low so ESP functions are disabled. I have seen TIPM codes get thrown in regards to the transfer case but nothing that caused the PCM to go into limp.

The JK does get it's vehicle speed from the ABS module and the system does the math to compute vehicle speed when in 4 low based on the programmed ratio.

I'm sorry I don't know how the 12-13' PCM reacts yet since we have the luxury of dumbing down the Chrysler system so it can do no more harm and operate off the GM LS computer
So, the rubicon transfer case I purchase either needs to be from a 2011 or earlier JK or if from a 2012 or 2013 it needs to be off an auto transmission rig. Am I understanding your post correctly?

I spoke with AEV about the capabilities of the Procal and if it could program for the 4:1 ratio. I was told that the new (not realesed yet) model could. They expect it to be out in Feb. The person I spoke with said he didn't think I would have a problem. He said it would not go into limp mode however, the engine may not rev past 3000 RPM while in 4 low. He recommended I do the swap and get back to them if I encountered any problems with the PCM. They seemed extremely confident that they could work around any issues that may come up with the procal.
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post #8 of 61 Old 12-13-2012, 07:45 AM Thread Starter
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Quote:
Originally Posted by RockyClymer View Post
Yes, direct swap...did mine in about 4 hours by myself.
Details please? From what year model to what year model? Also, was it off the same transmission as in the new jeep?

Thanks, David M
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post #9 of 61 Old 12-15-2012, 05:18 PM Thread Starter
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Anybody else have more info? I would really like some confirmation before committing to a purchase. I found a guy selling a 2011, six speed manual trans, rubicon transfer case. My jeep is a 2013 JKU sport, auto transmission.

I spoke with advanced adaptors on Friday and the guy I spoke with was under the impression it would NOT work. He thought there was a difference between the 6 speed and Auto transmission Tcases. Can anybody confirm this with a high level of certainty?

Thanks, David M
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post #10 of 61 Old 12-15-2012, 05:26 PM
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I have a 12' auto and manual TC at the shop, I'll try and get some pics up.

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post #11 of 61 Old 12-18-2012, 05:12 PM
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Here is the 12' auto planatary with external spline input gear vs a standard 241J. The bearing in the front case is entirely different too.

forumrunner_20121218_161002.jpg

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post #12 of 61 Old 12-18-2012, 08:40 PM
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Wasn't the OP asking about swaping a JK 241OR (4:1)for a JK 241 (2.72:1)? Or was he suggesting a TJ rubi case into a JK? Obviously the latter cannot work.

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post #13 of 61 Old 12-18-2012, 10:41 PM Thread Starter
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Quote:
Originally Posted by RockyClymer View Post
Wasn't the OP asking about swaping a JK 241OR (4:1)for a JK 241 (2.72:1)? Or was he suggesting a TJ rubi case into a JK? Obviously the latter cannot work.
No, I was not referencing the TJ rubi case at all. If I understand what vegasrobbi is saying...He is showing the difference between the '07-'11 transfer case and the 2012/13 transfer case.


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post #14 of 61 Old 12-19-2012, 09:37 AM
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Quote:
Originally Posted by David_M View Post

No, I was not referencing the TJ rubi case at all. If I understand what vegasrobbi is saying...He is showing the difference between the '07-'11 transfer case and the 2012/13 transfer case.


David M
That is correct if you have a 12-13' with the 5 speed auto.

If you have a 12-13' with a 6 speed manual you can interchange with the earlier 241's.

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post #15 of 61 Old 12-19-2012, 09:47 AM
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My understanding is that a 241J tcase came and fit with a 97 to 06 TJ 6 cylinder wrangler and with mods will fit 91-95 YJ, XJ or ZJ.
I understand these are not the same as the 241J tcases that came with the 07 and up JKs with a 2.72 ratio.
I think some very clear info is needed on this thread to un-confuse what tcase is coming from the donor (year make, etc) and what
is proposed going as a replacement...all one has to do to see the confusion is to Google NV241J and read...what is what?

I know it would help me a lot in the future...tnx in advance.

08 JK 23S - Colorado Jeep Club No. 204
Too much to list - see my profile for details on build
NRA Life member
"It takes a special kind of stupid to believe criminals will follow gun laws."
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