np 231 question - Pirate4x4.Com : 4x4 and Off-Road Forum

pilothillcrawler · 09-08-2006, 11:07 AM

NP 231, is it the stock case for a 2000 TJ Sport?

Pietro · 09-08-2006, 11:14 AM

yeah, all TJ's have a 231 unless its a Rubislut, then its a 241OR

Murfman · 09-08-2006, 11:24 AM

You can look at the back of your xfer case and find the data plate on it. It will ID it for you.

pilothillcrawler · 09-08-2006, 11:38 AM

looking to buy and wanted to know for reference when looking

Scout Dork · 09-08-2006, 12:03 PM

Just make sure the person selling the np231 knows what they have.
The plate on the back might say 231, but it doesn't mean it will work with your vehicle. I haven't found a web site that de-codes the plate. The input spline count might be different, 21, 23, 27. You need to know yours so, you know what to look for.
Scout Dork

CCJC · 09-08-2006, 12:08 PM

The only input splines on the NP 231 are 21 and 23. 21 splines came with ALL 4 bangers and the 4.2Ls and the 23 splines are on ALL 4.0L.

Scout Dork · 09-08-2006, 01:20 PM

Some people sell chevy 27 spline np231's, as just a np231.

That's why I posted that you need to know what the seller has, and what you need.

Just research different engine /tranny combos and you can find what you need.

Scout Dork

tikitgvr · 09-08-2006, 05:08 PM

I actually have one for sale that came from behind a 4cyl...

Bubba_Jeep · 09-09-2006, 04:48 PM

'87-'89(?) Wranglers and Cherokees with straight six engines and 5spds are 21spline inputs to the transfer case. The Peugeot was the trans used in those models, and had a 21 spline output shaft. Not sure of last model year used.

Chrysler dropped the BA5-10 (Peugeot) in favor of the AX15. The AX15 has a 23 tooth output shaft.

JrP · 09-09-2006, 07:23 PM

you have to watch input lengths also. Cherokee and ones from behind an ax 15 have short inputs. Th autos in wranglers have long inputs. If you use a short input in an auto it will leak like a sive out of the weep hole. Been there done that. Tera makes a bad ass seal extender that works great.

09-08-2006, 11:07 AM	#1 (permalink)
pilothillcrawler Registered User Join Date: Jul 2006 Member # 76609 Location: Pilot Hill, CA now Woodland, CA; 1 hour further from the con :( Posts: 507	np 231 question NP 231, is it the stock case for a 2000 TJ Sport?

09-08-2006, 11:14 AM	#2 (permalink)
Pietro Registered User Join Date: Nov 2004 Member # 38563 Location: Waterboro, ME Posts: 2,465	yeah, all TJ's have a 231 unless its a Rubislut, then its a 241OR __________________ 95' 4Runner with 5VZ engine WTB...winch bumper 84' M1031 CUCV 37's, 8kW gen

09-08-2006, 11:24 AM	#3 (permalink)
Murfman Registered User Join Date: May 2002 Member # 11973 Location: Colorado Springs, Co Posts: 573	You can look at the back of your xfer case and find the data plate on it. It will ID it for you. __________________ Only in a Jeep

09-08-2006, 12:03 PM	#5 (permalink)
Scout Dork Registered User Join Date: Apr 2000 Member # 661 Location: Directly under the Earth's Sun...........................Now Posts: 104	Just make sure the person selling the np231 knows what they have. The plate on the back might say 231, but it doesn't mean it will work with your vehicle. I haven't found a web site that de-codes the plate. The input spline count might be different, 21, 23, 27. You need to know yours so, you know what to look for. Scout Dork __________________ For Legal Advice: bettercallsaul.com Last edited by Scout Dork; 09-08-2006 at 12:05 PM.

09-08-2006, 12:08 PM	#6 (permalink)
CCJC Registered User Join Date: Feb 2005 Member # 42789 Posts: 109	The only input splines on the NP 231 are 21 and 23. 21 splines came with ALL 4 bangers and the 4.2Ls and the 23 splines are on ALL 4.0L. __________________ '95 YJ w/OME lift, 33" SSRs, front & rear ARB, and a Warn 8274, NOW WITH FORD 8.8 & 4.0L Chinook Country Jeep Club ECO Four Wheeling Society Calgary Jeep Association

09-08-2006, 11:38 AM	#4 (permalink)
pilothillcrawler Registered User Join Date: Jul 2006 Member # 76609 Location: Pilot Hill, CA now Woodland, CA; 1 hour further from the con :( Posts: 507	looking to buy and wanted to know for reference when looking

09-08-2006, 01:20 PM	#7 (permalink)
Scout Dork Registered User Join Date: Apr 2000 Member # 661 Location: Directly under the Earth's Sun...........................Now Posts: 104	Some people sell chevy 27 spline np231's, as just a np231. That's why I posted that you need to know what the seller has, and what you need. Just research different engine /tranny combos and you can find what you need. Scout Dork __________________ For Legal Advice: bettercallsaul.com

09-08-2006, 05:08 PM	#8 (permalink)
tikitgvr Registered User Join Date: Jul 2006 Member # 74903 Posts: 356	I actually have one for sale that came from behind a 4cyl...

09-09-2006, 04:48 PM	#9 (permalink)
Bubba_Jeep Registered User Join Date: Oct 2004 Member # 37184 Location: Santa Barbara, CA Posts: 1,323	'87-'89(?) Wranglers and Cherokees with straight six engines and 5spds are 21spline inputs to the transfer case. The Peugeot was the trans used in those models, and had a 21 spline output shaft. Not sure of last model year used. Chrysler dropped the BA5-10 (Peugeot) in favor of the AX15. The AX15 has a 23 tooth output shaft. Last edited by Bubba_Jeep; 09-09-2006 at 04:51 PM.

09-09-2006, 07:23 PM	#10 (permalink)
JrP Wheeler Join Date: May 2002 Member # 11873 Location: PA Posts: 307	you have to watch input lengths also. Cherokee and ones from behind an ax 15 have short inputs. Th autos in wranglers have long inputs. If you use a short input in an auto it will leak like a sive out of the weep hole. Been there done that. Tera makes a bad ass seal extender that works great. __________________ www.eastcoastwillys.org east coast willys association www.paffc.org Pa flat fender club

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