Feasibility of "easily" swapping NV241OR 4:1 T-Case into 2011 JK Sport 2dr (Manual)? - JeepForum.com
 
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post #1 of 6 Old 01-06-2016, 07:40 PM Thread Starter
TrailRated2011
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Feasibility of "easily" swapping NV241OR 4:1 T-Case into 2011 JK Sport 2dr (Manual)?

Feasibility of "easily" swapping a NV241OR 4:1 (Rock-Trac) Transfer Case into an existing non-Rubicon 2011 JK Sport 2dr model (w/Manual Transmission)?

My current Transfer Case is OEM: NV241 GII COMMAND-TRAC® with a low range ratio of 2.72:1.

I'd like to swap it for a NV241OR (Rock-Trac) transfer case with a low range ratio of 4:1.

QUESTIONS

As far as you know, what's the level of difficulty associated with this type of modification --- complex and problematic or a no-brainer removal and bolt-in to swap out? Known issues / risks with this kind of modification?

Where can I learn more?

BACKGROUNDER

My original (2011 JK Sport 2dr model) factory crawl ratio was: 4.46 x 2.72 x 3.21 = 38.9:1 (trans ratio x transfer case ratio x diff ratio = crawl ratio)

With my post-purchase re-gearing a few years ago and original factory transfer case low range ratio of 2.72 its current crawl current ratio is: 4.46 x 2.72 x 4.56 = 55.3:1

That's a 42% increase in the OEM crawl ratio, which translates into a 42% reduction in crawl speed if all else remains equal (tire size).

In the future, if I swap the OEM transfer case that has a low range ratio of 2.72:1 with the 4:1 --- the resulting crawl ratio will be 4.46 x 4 x 4.56 = 81.3:1

Noteworthy: Remember that it's called "crawling" for a reason. When off-roading I use a low gear and low-range 4WD and just let the vehicle crawl and idle (with as little throttle as needed) when going over obstacles like rocks or logs. Noteworthy too is that the ideal speed for rock crawling is 1-3 miles per hour.


TrailRated2011
Canada - Nat'l Capital Region
Know your angles before approaching obstacles and
follow the general rule of off-roading, "Go as slow as you can, as fast as you must."
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post #2 of 6 Old 01-07-2016, 07:42 AM
tarditi
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Not interested in an aftermarket xfer case like an Atlas or something?

Dustin Tarditi
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post #3 of 6 Old 01-07-2016, 08:34 AM
SLADE
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It's a pretty common, easily done, Bolt on swap.

You do need to make sure you have the right case for your transmission though. I THINK all will work except the 2012+ with the auto tranny.

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post #4 of 6 Old 01-07-2016, 05:51 PM
Wonk
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When I did this swap on my 2000 TJ it was a pretty straight forward swap with a little modification to the tranny mount on the skid and a different speedo gear if I remember right.
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post #5 of 6 Old 01-08-2016, 06:37 PM Thread Starter
TrailRated2011
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Thx

Thanks, appreciate all the feedback! Cheers+

TrailRated2011
Canada - Nat'l Capital Region
Know your angles before approaching obstacles and
follow the general rule of off-roading, "Go as slow as you can, as fast as you must."
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post #6 of 6 Old 01-09-2016, 05:05 PM
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Quote:
Originally Posted by SLADE
It's a pretty common, easily done, Bolt on swap. You do need to make sure you have the right case for your transmission though. I THINK all will work except the 2012+ with the auto tranny.
That is correct. The 2012+ auto went to a unique output shaft from the trans, so those t cases aren't swappable.

I did the swap alone in my driveway in under 5 hours way back when I wasn't the most skilled. Only hard part is getting the bolts at the top. Stubby 9/16" wrench is it. Better yet, one that ratchets. If not for those two top bolts, less than a 2 hour job.

Ignore the torque specs on the t case yokes. 160 ft lbs does not seat the yokes on my t case. I hit them with an impact until the slop is gone. You're supposed to use new nuts, but no one can seem to find them for the t case.
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4:1 , crawl ratio , nv241or (rock-trac) , transfer case

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