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Old 07-17-2019, 08:27 AM
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Transfer case gearing change

Is it possible to change the gearing in a transfer case to the gearing
that is found in the Rubicon transfer case (2017)

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Old 07-17-2019, 08:36 AM   #2
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I wondered the same thing, watching for responses to this !

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Old 07-17-2019, 08:49 AM   #3
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It is not possible.

There used to be a kit for the older NP231 transfer case to do it but they had a lot of problems with it and ended up dropping the product.

If you want 4:1 you need to buy a whole transfer case and swap it in.

And be sure to get the right one because there are differences between the input shafts depending on what year and what transmission. All manual transmission JKs and the automatic transmission JKs from 2007 to 2011 have one input shaft. The automatic from 2012 to 2018 uses a different shaft.

The other alternative is an aftermarket transfer case like that Atlas.

If you have a 2007 to 2011 automatic, you can look into the Advance Adapters Rubicrawler. It bolts in between the transmission and the transfer case and gives you an extra 2.72:1 low range. So you can run them both in low range for a 7.4:1 combined low range.
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Old 07-17-2019, 09:59 AM
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Quote:
Originally Posted by derf View Post
It is not possible.

There used to be a kit for the older NP231 transfer case to do it but they had a lot of problems with it and ended up dropping the product.

If you want 4:1 you need to buy a whole transfer case and swap it in.

And be sure to get the right one because there are differences between the input shafts depending on what year and what transmission. All manual transmission JKs and the automatic transmission JKs from 2007 to 2011 have one input shaft. The automatic from 2012 to 2018 uses a different shaft.

The other alternative is an aftermarket transfer case like that Atlas.

If you have a 2007 to 2011 automatic, you can look into the Advance Adapters Rubicrawler. It bolts in between the transmission and the transfer case and gives you an extra 2.72:1 low range. So you can run them both in low range for a 7.4:1 combined low range.
Thank u I have a 2017 with standard transmission do you know if that is the same for the automatic from 2012-2018
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Old 07-17-2019, 12:01 PM   #5
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Thank u I have a 2017 with standard transmission do you know if that is the same for the automatic from 2012-2018
It is not. You want to look for a Rubicon case from any 2007-2011 Wrangler or a 2012-2018 Wrangler with a manual transmission.
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Old 07-18-2019, 09:06 AM   #6
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Then be prepared to have to flash your computer after the exchange
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Old 07-24-2019, 07:38 PM   #7
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Quote:
Originally Posted by derf View Post
It is not possible.

There used to be a kit for the older NP231 transfer case to do it but they had a lot of problems with it and ended up dropping the product.

If you want 4:1 you need to buy a whole transfer case and swap it in.

And be sure to get the right one because there are differences between the input shafts depending on what year and what transmission. All manual transmission JKs and the automatic transmission JKs from 2007 to 2011 have one input shaft. The automatic from 2012 to 2018 uses a different shaft.

The other alternative is an aftermarket transfer case like that Atlas.

If you have a 2007 to 2011 automatic, you can look into the Advance Adapters Rubicrawler. It bolts in between the transmission and the transfer case and gives you an extra 2.72:1 low range. So you can run them both in low range for a 7.4:1 combined low range.
Neat. Any idea why it's so limited to 07-11 auto?
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Old 07-24-2019, 08:04 PM   #8
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Neat. Any idea why it's so limited to 07-11 auto?

It bolts in place of the tail housing on the transmission. So if you have manual, or anything other than the automatic it was made for, it doesn't "bolt in". I just found out about it two weeks ago, thought it was really neat, and got super disappointed that it won't work for anything else


For the guys that it will work for though, there's zero change to the drive lines because it replaces the tail housing
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Old 07-24-2019, 09:06 PM   #9
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Quote:
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Quote:
Originally Posted by MRBachand View Post
Neat. Any idea why it's so limited to 07-11 auto?

It bolts in place of the tail housing on the transmission. So if you have manual, or anything other than the automatic it was made for, it doesn't "bolt in". I just found out about it two weeks ago, thought it was really neat, and got super disappointed that it won't work for anything else [IMG class=inlineimg]https://www.wranglerforum.com/../images/smilies/frown.gif[/IMG]


For the guys that it will work for though, there's zero change to the drive lines because it replaces the tail housing [IMG class=inlineimg]https://www.wranglerforum.com/../images/smilies/wink.gif[/IMG]
I have a rubicrawler in my 2010 JKUR AT. It is a pretty cool little device. I use the 2.7:1 quite a bit, when 4:1 is too low. I’ve used the 10.8:1 super low a few times, but not frequently.
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