How to upgrade a NP231 transfer case - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > How to upgrade a NP231 transfer case

Rough Country Lift Kits and Parts!Dan's Old as Dirt Birthday Sale!Premium LED Lighting by VISION X, Proudly sold at ROCKRIDG

Reply
Unread 01-09-2011, 08:39 PM   #1
eak389
Registered User
2002 TJ Wrangler 
 
Join Date: Oct 2010
Location: LongIsland
Posts: 58
How to upgrade a NP231 transfer case

I blew my NP231 in the last snow storm - What can I do in the rebuild to toughen it up for future wheeling/ towing (side note I have 33 upgrading to 35's soon)

eak389 is offline   Reply With Quote
Unread 01-09-2011, 08:55 PM   #2
wushaw
Rockin jeep
 
wushaw's Avatar
2000 TJ Wrangler 
 
Join Date: Jan 2007
Location: Texas
Posts: 8,131
Remove it an install a 241OR or you could do the wide chain kit, or flipped dana 300 or Atlas II.
wushaw is offline   Reply With Quote
Unread 01-10-2011, 12:28 AM   #3
RogueSpear2023
Registered User
2003 TJ Wrangler 
 
Join Date: Jun 2008
Location: Fargo, ND
Posts: 6,950
Buy a rebuild kit and replace the chain with a wider stronger version. The NP231 is a strong transfer case, if took it out more than likely the chain was already stretched and finally just broke.
__________________
Max

2003 Jeep Wrangler Rubicon
4.0L, 42RLE, Dual Tops, Full Doors, JKS Front Disconnects, Cragar Soft 8 Black Wheels, 33x12.5x15 Goodyear Duratracs, .75" Front Coil Spacers, Bushwacker 6" Flat Fender Flares, Skid Row Steering Box Skid, LubeLockers, Rubicon Locker Mod, OBA, Cobra 19 Ultra III CB, 3' Firestik, Rough Country 2.2 Steering Stabilizer, RC 1.25" BL, RC 1" MML, RC Grab Handles, Fog Lamp Bent Pin Mod, 4" Apline S Series Speakers, Kenwood Excelon 6.5" Speakers, 6.5" JL Audio 6W3V3 Subwoofer (in center console) w/MTX Thunder 202 amp, IPF H4 Headlight Housing, Sliverstar H4 bulbs.



TJ Tech Boot Camp
TJ Specs

"Buying a jeep and not taking it off road, is like buying a dragster and never taking it to the track"
RogueSpear2023 is offline   Reply With Quote
Unread 01-10-2011, 06:54 AM   #4
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 23,249
SYE, wide chain kit, 6-planetary assembly. or you can buy a NP231HD.

www.jbconversion.com sells em.
Unlimited04 is offline   Reply With Quote
Unread 01-15-2011, 03:13 PM   #5
eak389
Registered User
2002 TJ Wrangler 
 
Join Date: Oct 2010
Location: LongIsland
Posts: 58
I bought the wide chain kit - Now I'm curious what SYE - Do i have to replace my drive shaft and what shaft I should get? any thoughts?
eak389 is offline   Reply With Quote
Unread 01-15-2011, 03:16 PM   #6
eak389
Registered User
2002 TJ Wrangler 
 
Join Date: Oct 2010
Location: LongIsland
Posts: 58
Forgot also bought the 6 pinion planetary gear -
eak389 is offline   Reply With Quote
Unread 01-15-2011, 03:20 PM   #7
bbuske
Registered User
2004 TJ Wrangler 
 
Join Date: Mar 2010
Location: Chico
Posts: 130
Quote:
Originally Posted by eak389 View Post
I bought the wide chain kit - Now I'm curious what SYE - Do i have to replace my drive shaft and what shaft I should get? any thoughts?
IMO Advanced Adapters and Tom Woods Combo, you can order right from AA's site. I have that combo, directions were great and AA's a proven manufacturer.
__________________
[QUOTE=Robert J. yates;10814931]Now don't be bringing logic into this[/QUOTE]

[SIZE="4"][COLOR="Blue"]Looking to Buy Full Doors and a HardTop near Northern California, PM me if you have them for sale or have a lead on some[/COLOR][/SIZE]
bbuske is offline   Reply With Quote
Unread 01-15-2011, 03:43 PM   #8
freeskier93
Web Wheeler
 
freeskier93's Avatar
1997 TJ Wrangler 
 
Join Date: Oct 2009
Location: Longmont, Colorado
Posts: 6,533
Quote:
Originally Posted by eak389 View Post
I bought the wide chain kit - Now I'm curious what SYE - Do i have to replace my drive shaft and what shaft I should get? any thoughts?
The link unlimited04 gave you to jpconversions, they have a super short SYE that gives you a lot of strength benefits. If you just look at their page they go into great detail about how much stronger their SYE is. It's def. the SYE I will be going with when the time comes.

http://www.jbconversions.com/product..._short_sye.php
freeskier93 is offline   Reply With Quote
Unread 01-15-2011, 05:39 PM   #9
Boodyrider
Registered User
1997 TJ Wrangler 
 
Join Date: Feb 2008
Location: Maryland
Posts: 2,519
Absolutely do the ultra short jbconversions SYE. The extra driveshaft length means much longer life for rear ujoints and more flex before driveshaft binding, in addition to the stronger build quality.

At the cost of the wide chain and 6 pinion upgrades... I'd have done the 241OR, in part for the 4-1 gearing.
__________________
97 TJ Sport - 4.0/HP D30 w ARB/8.8 w LS/4.88s; 35s and flat fenders on 2.5 lift

84 CJ7; frame off restoration in progress.

The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
Boodyrider is offline   Reply With Quote
Unread 01-15-2011, 05:45 PM   #10
Imped
Web Wheeler
 
Imped's Avatar
2004 TJ Wrangler 
 
Join Date: Feb 2008
Location: Indianapolis
Posts: 19,239
Quote:
Originally Posted by Boodyrider View Post
Absolutely do the ultra short jbconversions SYE. The extra driveshaft length means much longer life for rear ujoints and more flex before driveshaft binding, in addition to the stronger build quality.

At the cost of the wide chain and 6 pinion upgrades... I'd have done the 241OR, in part for the 4-1 gearing.
JB Conversions FTW. Best in the biz.
__________________
OlllllllO
Float Test Build
IndyORV
Imped is offline   Reply With Quote
Unread 01-15-2011, 05:59 PM   #11
Benderff
Registered User
 
Benderff's Avatar
2006 TJ Wrangler 
 
Join Date: Apr 2007
Location: , Pacific NorthWest
Posts: 5,125
From another thread

http://www.jeepforum.com/forum/f46/c.../#post10575195
__________________
Benderff is offline   Reply With Quote
Unread 01-15-2011, 06:27 PM   #12
snookhansel
Registered User
2002 TJ Wrangler 
 
Join Date: Dec 2009
Location: ky
Posts: 396
Quote:
Originally Posted by Imped View Post
JB Conversions FTW. Best in the biz.
i installed the jb conversions super short and love it. I couldnt say its the best only because i never personally compared to any other . I say it would be hard to beat though. they also are right on point as far as pricing goes. Check out their website and look at the engineering that has went into them.
snookhansel is offline   Reply With Quote
Unread 01-15-2011, 08:08 PM   #13
eak389
Registered User
2002 TJ Wrangler 
 
Join Date: Oct 2010
Location: LongIsland
Posts: 58
Thanks for the ideas -
eak389 is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.