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Author Topic: Wrangler JK Transfer case  (Read 2668 times)

Crawl

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Wrangler JK Transfer case
« on: July 07, 2016, 08:09:31 PM »

So.... I just picked up a JKU. Just like in my TJ i upgraded from, I want to swap into a Rubicon 4:1 transfer case. My JKU is a 6 speed manual. From the research I've done, I think I can use a T-case from either a manual or automatic 2007-2011 3.8l Rubi or 2012 to present manual only 3.6l Rubi. Does this sound right?
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2008 JKU

Rusty

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Re: Wrangler JK Transfer case
« Reply #1 on: July 08, 2016, 06:23:11 AM »

I have an Atlas in my YJ and a 4:1 Rubicon in my TJ,
if you're doing swaps I would highly recommend the Atlas.
Not real impressed with the planetary gear transfer case.
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Kodiak Commando

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Re: Wrangler JK Transfer case
« Reply #2 on: July 08, 2016, 09:49:54 AM »

Just install an atlas if you don't have the Rubicon case.  Much better solution, much stronger.
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Fred Whorff
1967 Jeepster Commando
2015 Rubicon Unlimmited
1951 Willys Pickup
1961 Willys Station Wagon
1991 Grand Wagoneer
Yes its a disease of epic proportions!

Crawl

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Re: Wrangler JK Transfer case
« Reply #3 on: July 11, 2016, 08:18:32 PM »

Thanks for the info guys. So, gear ratios.... 2 speed 4.3 or 5.*? Do you see an advantage to spend the extra $ to go with a 4 speed and get the additional ultra low 8.** or 10.** Ratio?
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Tony

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Re: Wrangler JK Transfer case
« Reply #4 on: July 11, 2016, 09:06:58 PM »

Hey Crawl, have you looked at the RubiCrawler transfer cases? They're designed for the JK's to directly replace the tailhousing behind the transmission (I'm sure you've done your homework). Not sure if it'll work with manual transmissions but I could be wrong...?
Good luck!
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Crawl

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Re: Wrangler JK Transfer case
« Reply #5 on: July 12, 2016, 08:25:20 AM »

Tony - unfortunately the Rubicrawler box is only available with the 42RLE automatic transmission in 2003-2012 as it has a detachable output shaft. ... No I'm not that smart, I called advanced adapters LOL ;)
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Rusty

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Re: Wrangler JK Transfer case
« Reply #6 on: July 12, 2016, 08:53:21 AM »

Thanks for the info guys. So, gear ratios.... 2 speed 4.3 or 5.*? Do you see an advantage to spend the extra $ to go with a 4 speed and get the additional ultra low 8.** or 10.** Ratio?
4.3:1, any lower and you will hate it. I can only do about 12 miles per hour wide open in low range and 5th gear with my 4.3:1 Atlas.
Most guys with Jeeps are going with the 4.3:1, it seems to be the best crawl ratio.
« Last Edit: July 12, 2016, 09:25:59 AM by Rusty »
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cruiserfj45

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Re: Wrangler JK Transfer case
« Reply #7 on: July 12, 2016, 09:34:24 AM »

I vote for the 4 speed so you have a 2.72 low for those times when the 4:1 is too low.  Then you also have that dbl low for when you want control in those tight places.  You have plenty of room for the extra lengthen.
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Only through you Lord can I do great things, and may the great things I do Lord glorify you.  The Lord never gives you more than you can handle.

Kodiak Commando

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Re: Wrangler JK Transfer case
« Reply #8 on: July 12, 2016, 08:19:25 PM »

The 4 speed is really designed for a highway geared vehicle.  I have one on Leslie's Grand Wagoneer so that we have the 3.10 gears for highway efficiency.  However, it was really nice wheeling in the San Juans of Colorado with that extra deep gearing.  I wouldn't put a 4 speed in a JK that is already geared 4.10 to 5.13.  My opinion anyway.   I used the 4.3:1 Atlas's in the Sportsmobiles as well as my Commando.  5 gives you too big a step and will frustrate you.
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Fred Whorff
1967 Jeepster Commando
2015 Rubicon Unlimmited
1951 Willys Pickup
1961 Willys Station Wagon
1991 Grand Wagoneer
Yes its a disease of epic proportions!

Crawl

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Re: Wrangler JK Transfer case
« Reply #9 on: July 13, 2016, 02:46:54 PM »

Good info. Thank you guys.
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cruiserfj45

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Re: Wrangler JK Transfer case
« Reply #10 on: July 13, 2016, 05:24:05 PM »

What gears do you have in the axles?
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Only through you Lord can I do great things, and may the great things I do Lord glorify you.  The Lord never gives you more than you can handle.

Crawl

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Re: Wrangler JK Transfer case
« Reply #11 on: November 03, 2016, 05:32:11 PM »

You win rusty. Crawl has a 4 speed atlas now!!!
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Rusty

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Re: Wrangler JK Transfer case
« Reply #12 on: November 04, 2016, 07:12:28 AM »

Good for you Amigo! You won't regret it.
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