NP231 swap out - Pirate4x4.Com : 4x4 and Off-Road Forum

YJJPWrangler · 10-24-2005, 02:34 PM

Hey i busted my NP231 the other day(put a hole in the rear of it) and i was gonna switch it to my friends NP231 that came out of his 94 cherokee. Mine came out of an 87 Wrangler. Mine has a vacuum line and his is electrical. Is this a problem? Can i mate my front half with his rear half?
Also, im getting a SYE as part of the deal. Whats the best driveshaft to go with?

Zack

apeters89 · 10-24-2005, 03:01 PM

the 94 will have the incorrect input shaft for your 87 tranny. You should be able to swap your input shaft to the 94 t-case. The vacuum switch will most likely be able to be unscrewed from the 87 case and screwed onto the 94 case. That vacuum switch only powers your front axle disconnect anyway. In theory you should remove the vacuum from that axle anyway and either build a cable-lock setup, or install TJ shafts (or swap that axle out completely).

edit: for driveshaft, there are two major sponsors on this board... JE Reel and High-Angle. You could of course always go to a local driveline shop as well.

YJJPWrangler · 10-24-2005, 07:49 PM

why would the xcase from the 94 have a different input shaft? Also I'm not really technical on trans cases. Is the input shaft the shaft that goes into the transmission? Also if i did have to switch input shafts...how much is one?

Zack

apeters89 · 10-24-2005, 09:09 PM

Quote:

Originally Posted by YJJPWrangler

why would the xcase from the 94 have a different input shaft? Also I'm not really technical on trans cases. Is the input shaft the shaft that goes into the transmission? Also if i did have to switch input shafts...how much is one?

Zack

The 87 t-case should have a 21 spline input shaft whereas the 94 case has a 23 spline input shaft. You would take the input shaft out of your 87 case and put it into your 94 case. Yes the input shaft is the part that goes into the transmission. Honestly I'm not sure you should be doing this part on your own if you don't already know what an input shaft is.

YJJPWrangler · 10-24-2005, 09:32 PM

yeah, my friend who is selling me the tcase will be doing it. He has done it before so he knows what he is doing. Do you know how the vacuum switch on my xcase comes out...the new one can unscrew but i don't think mine can.

Zack

XJ_ranger · 10-24-2005, 10:04 PM

your back half should fit

when swaping the input shaft and planatary gearset, you might have an issue with the input bearing.

here is what i went thru to put a 1997 TJ case in a 1992 XJ

http://www.opiebennett.com/images/Je...2015/np231.htm

YJJPWrangler · 10-24-2005, 10:23 PM

ok thanx man...i think we will tear it apart on wed...i really don't want to tear both of them apart and mate them together...so i should just change the input shaft right? (sorry, i need confirmation, its my dd and i need to get it back on the road) Thanx again

Zack

offroadmission · 10-25-2005, 06:42 AM

the case from the 87 wrangler is not a np231 it is a np207. just so you know.

apeters89 · 10-25-2005, 06:57 AM

Quote:

Originally Posted by offroadmission

the case from the 87 wrangler is not a np231 it is a np207. just so you know.

crap... I'm glad you were paying attention. Somehow I remembered the 21 spline, but not the fact that it was a 207.

ok, yet another question to ask... is your friends case from a 4cyl Jeep? If so it should actually bolt in, if not then you will need an input shaft from a 4 cyl Jeep 231.

YJJPWrangler · 10-25-2005, 07:54 AM

nope...it says NP231 AMC so im guessing it was one of the last production models for AMC. I have the 4.2 I-6 in mine and his jeep had a 6 in his too. cant i just switch input shafts?

Zack

apeters89 · 10-25-2005, 04:56 PM

Quote:

Originally Posted by YJJPWrangler

nope...it says NP231 AMC so im guessing it was one of the last production models for AMC. I have the 4.2 I-6 in mine and his jeep had a 6 in his too. cant i just switch input shafts?

Zack

never heard of an NP231 AMC,seen an NP231J

I have no idea which input shaft your 6 cyl will have 'cause I never heard of an 87 with a 231. What tranny you got?

offroadmission · 10-25-2005, 07:29 PM

correct me if i'm wrong.....but wasn't the yj the first jeep of the chrysler era?
therefore no amc.

calltrex · 10-25-2005, 07:35 PM

My 88 yj has a np231

i just put a super short SYE kit in

YJJPWrangler · 10-25-2005, 08:01 PM

the tag says NP231 AMC not lying

and the YJ was the first model made from Daimler..i have the Peugot manual tranny, the input shaft on mine is 21 spline...I called Advance Adapters and they said it would work if the serial numbers were the same on the x cases.

Zack

87wrangler · 10-25-2005, 08:13 PM

he is right the last half of the production year the did swithc to the np 231. and yes is is stamped 231amc.

and fyi the first year of the wrangler wes both designed and built by amc.

Bobbo3234 · 10-25-2005, 09:21 PM

Quote:

Originally Posted by calltrex

My 88 yj has a np231

i just put a super short SYE kit in

as it should

YJJPWrangler · 10-26-2005, 04:14 AM

so i can just change the input shafts right guys? Im gonna tear it apart today and see whats going on on the inside.

Zack

apeters89 · 10-26-2005, 08:51 AM

Quote:

Originally Posted by YJJPWrangler

so i can just change the input shafts right guys? Im gonna tear it apart today and see whats going on on the inside.

Zack

yes, you can take the input from the 87 case and put it into the 94 case.

YJJPWrangler · 10-26-2005, 10:30 AM

well ill find out this afternoon if it all works together, going over there after classes today to work on it. Thanks for all the help guys.

Zack

10-24-2005, 02:34 PM	#1 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	NP231 swap out Hey i busted my NP231 the other day(put a hole in the rear of it) and i was gonna switch it to my friends NP231 that came out of his 94 cherokee. Mine came out of an 87 Wrangler. Mine has a vacuum line and his is electrical. Is this a problem? Can i mate my front half with his rear half? Also, im getting a SYE as part of the deal. Whats the best driveshaft to go with? Zack Last edited by YJJPWrangler; 10-24-2005 at 02:35 PM.

10-24-2005, 03:01 PM	#2 (permalink)
apeters89 Moderator Join Date: Oct 2001 Member # 7647 Location: Oklahoma City Posts: 7,574 Blog Entries: 2	the 94 will have the incorrect input shaft for your 87 tranny. You should be able to swap your input shaft to the 94 t-case. The vacuum switch will most likely be able to be unscrewed from the 87 case and screwed onto the 94 case. That vacuum switch only powers your front axle disconnect anyway. In theory you should remove the vacuum from that axle anyway and either build a cable-lock setup, or install TJ shafts (or swap that axle out completely). edit: for driveshaft, there are two major sponsors on this board... JE Reel and High-Angle. You could of course always go to a local driveline shop as well. __________________ Check out our new Team Ape Eater Racing Like us on FaceBook KF5EQF Sniper Fab 4x4Oil SBwinVPS Custom Splice C2GFab Last edited by apeters89; 10-24-2005 at 03:02 PM.

10-24-2005, 07:49 PM	#3 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	why would the xcase from the 94 have a different input shaft? Also I'm not really technical on trans cases. Is the input shaft the shaft that goes into the transmission? Also if i did have to switch input shafts...how much is one? Zack Last edited by YJJPWrangler; 10-24-2005 at 08:44 PM.

10-25-2005, 06:42 AM	#8 (permalink)
offroadmission Registered User Join Date: Apr 2004 Member # 29415 Location: north carolina Posts: 190	the case from the 87 wrangler is not a np231 it is a np207. just so you know. __________________ For whosoever shall call upon the name of the Lord shall be saved. ROMANS 10:13 For God so loved the world that He gave His only begotten Son, that whosoever believeth in Him should not perish, but have everlasting life. JOHN 3:16

10-25-2005, 07:54 AM	#10 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	nope...it says NP231 AMC so im guessing it was one of the last production models for AMC. I have the 4.2 I-6 in mine and his jeep had a 6 in his too. cant i just switch input shafts? Zack Last edited by YJJPWrangler; 10-25-2005 at 12:09 PM.

10-24-2005, 09:32 PM	#5 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	yeah, my friend who is selling me the tcase will be doing it. He has done it before so he knows what he is doing. Do you know how the vacuum switch on my xcase comes out...the new one can unscrew but i don't think mine can. Zack

10-24-2005, 10:23 PM	#7 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	ok thanx man...i think we will tear it apart on wed...i really don't want to tear both of them apart and mate them together...so i should just change the input shaft right? (sorry, i need confirmation, its my dd and i need to get it back on the road) Thanx again Zack

10-25-2005, 07:29 PM	#12 (permalink)
offroadmission Registered User Join Date: Apr 2004 Member # 29415 Location: north carolina Posts: 190	correct me if i'm wrong.....but wasn't the yj the first jeep of the chrysler era? therefore no amc. __________________ For whosoever shall call upon the name of the Lord shall be saved. ROMANS 10:13 For God so loved the world that He gave His only begotten Son, that whosoever believeth in Him should not perish, but have everlasting life. JOHN 3:16

10-25-2005, 07:35 PM	#13 (permalink)
calltrex Registered User Join Date: Dec 2004 Member # 39996 Posts: 59	My 88 yj has a np231 i just put a super short SYE kit in

10-25-2005, 08:01 PM	#14 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	the tag says NP231 AMC not lying and the YJ was the first model made from Daimler..i have the Peugot manual tranny, the input shaft on mine is 21 spline...I called Advance Adapters and they said it would work if the serial numbers were the same on the x cases. Zack Last edited by YJJPWrangler; 10-25-2005 at 08:02 PM.

10-25-2005, 08:13 PM	#15 (permalink)
87wrangler Registered User Join Date: Mar 2005 Member # 44872 Posts: 4	he is right the last half of the production year the did swithc to the np 231. and yes is is stamped 231amc. and fyi the first year of the wrangler wes both designed and built by amc.

10-26-2005, 04:14 AM	#17 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	so i can just change the input shafts right guys? Im gonna tear it apart today and see whats going on on the inside. Zack

10-26-2005, 10:30 AM	#19 (permalink)
YJJPWrangler Registered User Join Date: Oct 2005 Member # 56126 Location: Greenville NC Posts: 51	well ill find out this afternoon if it all works together, going over there after classes today to work on it. Thanks for all the help guys. Zack

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