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Rock-Trac Transfercase Swap?
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=19156		 Page 1 of 1
Author:  Kugellager [ Sat Mar 31, 2007 12:46 pm ]
Post subject:  Rock-Trac Transfercase Swap?
Ok I was just wondering if this is a direct bolt up for our NV231/NP231 transfer case?

Quote:
It is designed as a bolt-in replacement for 23 spline NP231J cases


Is our case the 23 spline or the 21 spline?

Rock-Trac Transfercase 4:1 - Several places have it for this price.

If this is a direct bolt-in can our front/rear differentials and axels handle the extra torque that this will put out?

This would give those of us with a 6-speed manual transmission a 63.3:1 crawl ration!

John
];')
Author:  spoonplugger1 [ Sat Mar 31, 2007 1:00 pm ]
Post subject: 
Torque won't change, the axles are on the good side of the battle here.
Author:  jason thompson [ Sat Mar 31, 2007 1:40 pm ]
Post subject: 
with that you may need a new front DS and will need a new rear
You may be able to have the front retubed but you will need a rear DS with a slip joint

If you are going to go through all that trouble you could spend 1/2 as much an go with a tera low conversion
it should work in the 231 case but you will still need a hew rear DS
You could get the front from a XJ and retube ,that is what I have out back of the TJ and lucky me the front and rear use the same U-joints
This is what I am thinking of doing to the KJ but that will be later in life
Author:  Neatus [ Sat Mar 31, 2007 3:55 pm ]
Post subject: 
The front drive shaft on the KJ has CV joints instead of U Joints....so I would replace it anyway with one with U Joints unless you like to pay 500 bucks everytime you have problems with the front shaft.
Author:  tjkj2002 [ Sat Mar 31, 2007 5:33 pm ]
Post subject:  Re: Rock-Trac Transfercase Swap?
Kugellager wrote:
Ok I was just wondering if this is a direct bolt up for our NV231/NP231 transfer case?

Quote:
It is designed as a bolt-in replacement for 23 spline NP231J cases


Is our case the 23 spline or the 21 spline?

Rock-Trac Transfercase 4:1 - Several places have it for this price.

If this is a direct bolt-in can our front/rear differentials and axels handle the extra torque that this will put out?

This would give those of us with a 6-speed manual transmission a 63.3:1 crawl ration!

John
];')
Our cases are 23 spline,It will work in our KJ's,need to have new drive shafts made though.1 ton tranfer case in a itty bitty Jeep :lol: ,I love it!
Author:  chefdab [ Sat Mar 31, 2007 7:12 pm ]
Post subject: 
Come on go for it! I've been waiting to see somebody actually do this swap..
Author:  tjkj2002 [ Sat Mar 31, 2007 7:59 pm ]
Post subject: 
chefdab wrote:
Come on go for it! I've been waiting to see somebody actually do this swap..
There is already a KJ with one in it,Allyrand's.
Author:  JJsTJ [ Sat Mar 31, 2007 10:55 pm ]
Post subject: 
OT, but I just got my shaft and yoke to put mine (241OR) into my XJ. I have a feeling that it might eventually land in the KJ but only after I beat up on it in the XJ first. (really wanted in the xj for the Rubicon trip)

You need to replace the balancer style rear shaft mount and use a yoke on the back side (not sure if it uses that same balancer style on the Auto Rubis?) and then a cv style driveshaft front & rear. I got the yoke from JE REEL, #2-4-5341-10R, $65 and CV shaft runs about $300.
Author:  tjkj2002 [ Sat Mar 31, 2007 11:27 pm ]
Post subject: 
JJsKJ wrote:
OT, but I just got my shaft and yoke to put mine (241OR) into my XJ. I have a feeling that it might eventually land in the KJ but only after I beat up on it in the XJ first. (really wanted in the xj for the Rubicon trip)

You need to replace the balancer style rear shaft mount and use a yoke on the back side (not sure if it uses that same balancer style on the Auto Rubis?) and then a cv style driveshaft front & rear. I got the yoke from JE REEL, #2-4-5341-10R, $65 and CV shaft runs about $300.
You can actually use the same style yoke that is on the front for the rear,they are both 32 spline outputs,seen a artical that showed it works.http://www.jbconversions.com/pages/reviews/showpage.php?m=4wor&i=2004.07_n2&p=2
Author:  JJsTJ [ Sun Apr 01, 2007 12:12 am ]
Post subject: 
tjkj2002 wrote:
JJsKJ wrote:
OT, but I just got my shaft and yoke to put mine (241OR) into my XJ. I have a feeling that it might eventually land in the KJ but only after I beat up on it in the XJ first. (really wanted in the xj for the Rubicon trip)

You need to replace the balancer style rear shaft mount and use a yoke on the back side (not sure if it uses that same balancer style on the Auto Rubis?) and then a cv style driveshaft front & rear. I got the yoke from JE REEL, #2-4-5341-10R, $65 and CV shaft runs about $300.
You can actually use the same style yoke that is on the front for the rear,they are both 32 spline outputs,seen a artical that showed it works.http://www.jbconversions.com/pages/reviews/showpage.php?m=4wor&i=2004.07_n2&p=2


Yes, correct. the one I got is basically the same and has a seal protector installed on it. I had to buy it from somewhere and I was ordering a new front shaft for the XJ from JE REEL so I had them throw it in the box. :wink:
Author:  Kugellager [ Sun Apr 01, 2007 4:51 pm ]
Post subject: 
When a L.O.S.T member finally does do this swap they need to do a good tech write-up with photos and a parts list...especially a parts list.

It will be great to see how it performs.

This is something I too would like to do with my manual at some point...Those of us with a manual already have a better crawl ratio than all you auto tranny guys...Actually wondering if it might be too much as on flat-smooth parts of the trail I already shift into 3rd and occasionally 4th gear as it is.

John
];')
Author:  chefdab [ Sun Apr 01, 2007 5:34 pm ]
Post subject: 
tjkj2002 wrote:
chefdab wrote:
Come on go for it! I've been waiting to see somebody actually do this swap..
There is already a KJ with one in it,Allyrand's.


I was referring to someone with a KJ that was still IFS but wanted the better crawl ratio. Allyrand's KJ is a little more of a one off type thing. I was thinking of something the masses could do.
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