Writeups for NP 231 input shaft swaps...

mopar440

NAXJA Forum User

Location

Jefferson, Oregon

• May 22, 2012

• #1

Anybody know of a good writeup for swapping input shafts on an NP 231? Need to replace my transfer case, found one but it's for an automatic and mine's a 5 speed... need to swap shafts... never had one apart before, and knowledge is power!!! Need to do this soon so we can get the latest XJ out there on the trail!

 

mopar440

NAXJA Forum User

Location

Jefferson, Oregon

• May 22, 2012

• #2

BTW... here she is... '95, 4.0, AX-15/NP231, 8.25 (open) rear, 3.07 gears... 301,000 miles but still runs great and gets 17-18 mpg, and blows COLD air... only issue is stretched/broken chain in t-case, but drove it away for $600 bucks!!!
http://img.photobucket.com/albums/v603/krasjeep/2_imagejpeg952.jpg

 

dellstopjeep

NAXJA Forum User

Location

KUNA, ID

• May 22, 2012

• #3

Same input unless pre 89. Should just swap over

 

mopar440

NAXJA Forum User

Location

Jefferson, Oregon

• May 22, 2012

• #4

Are you sure? Thought auto was a little longer than manual... hopefully I'm wrong... both rigs are '95, mines AX-15, doner is AW4... confirm?

 

jonesinxj

NAXJA Forum User

Location

Granite Falls, WA

• May 22, 2012

• #5

Your trans may have a longer tail housing, but the inputs on the transfer
Cases will be the same. As Eric said, pre 90 was different. 21 spline vs 23 spline count

 

mopar440

NAXJA Forum User

Location

Jefferson, Oregon

• May 22, 2012

• #6

thanks my brotha

 

WaXJ_Skier

NAXJA Forum User

Location

Bellevue, Wa

• May 23, 2012

• #7

94 and later AX15s require a longer input shaft on the Xfer case, if you don't swap the inputs you full not have full spline engagement.

 

jonesinxj

NAXJA Forum User

Location

Granite Falls, WA

• May 23, 2012

• #8

Interesting to know!!! Thanks joe for that bit of knowledge!!!

 

K

KingIce

NAXJA Forum User

Location

Munich, Germany

• May 23, 2012

• #9

Here you can look up everything in detail:

http://www.novak-adapt.com/knowledge/np_nvg_input_gears.htm

 

kenny811

NAXJA Forum User

Location

Damascus, OR

• May 23, 2012

• #10

I just did one and here is what I did. I found the input gear in Portland at All Transmissions On Argyle St. I had 2 complete cases an 88 & 87 I tool the 88 apart rebuilt it with the new gear ( $75 ) all new seals, chain & fork pads. It really wasn't that hard. Not alot of parts in there to get mixed up. Just have a clean bench and should be fine. All the inside parts cost $140, SYE and it worked great the first time out. If you need assembly help, just ask!!