TJ ax5/np231 conversion write-up -
LinkBack Thread Tools
post #1 of 3 Old 02-17-2009, 03:18 PM Thread Starter
Registered User
1991 YJ Wrangler 
Join Date: Apr 2007
Location: Vineland
Posts: 1,713
TJ ax5/np231 conversion write-up

as part of my build i'm gonna be using the AX5/NP231/and driveshaft out of a 97' TJ in my 91' YJ. The motor is out of a 93'. On pre-94' YJ's you will need to convert to an external slave cylinder,

or you could convert the TJ trans to an internal slave, but thats a stupid idea.

to do this the way i did you will need your old YJ trans as a donor for parts

I scored the trans to the driveshaft for $200 of a guy on craigslist.

swap the mount brackets over

it's 4 bolts

an thats what your left with, next you'll need to put the mount from your YJ trans on it. Since im swapping an engine at the same time im doing all the bolting up on the ground and then just gonna shoe horn it all in

next, you will need to swap out the speedo gear housings, its a single blot that holds down a C-shaped clip, the clip fits into grooves on the housing, once you remove the single bolt the hole assembly can pull straight out. On the TJ there is electronic speedo gear, where the 91' had a cable. If you have an electronic speedometer cable then this step can be skipped.

removing from old ax5

SteveJcoYJ is offline  
Sponsored Links
post #2 of 3 Old 02-17-2009, 03:19 PM Thread Starter
Registered User
1991 YJ Wrangler 
Join Date: Apr 2007
Location: Vineland
Posts: 1,713
here is the electronic unit being removed from the TJ AX5, same exact process

an here is the old swapped in

since TJ's dont have half shafts in the front they just had a 4wd sensor in the place where the vaccum connector is for a YJ on the tcase, The thread an size is the same so you can swap the vaccum connector in its place

it just screws out, here is the connector on the TJ ax5
SteveJcoYJ is offline  
post #3 of 3 Old 02-17-2009, 03:19 PM Thread Starter
Registered User
1991 YJ Wrangler 
Join Date: Apr 2007
Location: Vineland
Posts: 1,713
the CPS will also need to be swapped, different connectors, everything else is the same.

after that i swapped the lower shifter housing

its 4 bolts and then it picks right out
the same goes for the YJ trans

i cleaned the old housing out with brake cleaner and lightly sanded an cleaned all matting surfaces.

instead of hunting for the gasket

after its bolted back on your all set

next before re-installing the trans, there is never a better time to install a clutch kit

so i did, hopefully i'll be throwing it in the jeep within the week. i just need to buy a few missing bolts for my motor brackets.
SteveJcoYJ is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
NP231 Tera Low 4:1 conversion OR Atlas II sprowley YJ Wrangler Technical Forum 11 09-14-2009 05:46 PM
NP231 cable to electronic pickup(yj to tj conversion) need help! tuck TJ Wrangler Technical Forum 2 09-10-2009 05:21 AM
Will this fit a np231? (possible u bolt conversion) fireshadow YJ Wrangler Technical Forum 6 09-06-2009 01:27 PM
SOA conversion write up wessy YJ Wrangler Technical Forum 6 04-12-2007 03:17 PM
AX15/NP231 Conversion Diver Down YJ Wrangler Technical Forum 3 12-06-2004 12:49 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome