NP207 to NP231 swap - JeepForum.com
 
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post #1 of 6 Old 10-23-2013, 06:21 PM Thread Starter
jeepguy85
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1987 YJ Wrangler 
 
Join Date: Jan 2009
Location: Kingsport, Tennessee
Posts: 1,153
NP207 to NP231 swap

I am picking up an NP231 21 spline transfer case for my 87 Wrangler on Saturday. From everything I have read, the NP207 linkage does not fit the NP231 correctly. I read it was 2.5" too short, but it does not specify WHAT on it is too short. Can anyone that has done this swap give me some info? I am keeping the BA10 right now because I am also swapping in a Ford 8.8 and don't have the $$ to swap a tranny as well. Also, the BA10 is running good, no issues. Thanks in advance.


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Mean Max created Chuck Norris with some spare parts, two trac bars and some differential fluid.
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post #2 of 6 Old 10-24-2013, 07:49 AM Thread Starter
jeepguy85
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1987 YJ Wrangler 
 
Join Date: Jan 2009
Location: Kingsport, Tennessee
Posts: 1,153
bump.... anyone?

Quote:
Originally Posted by Exparrot View Post
"When Chuck Norris drives, Chuck Norris controls the radio..."
Quote:
Originally Posted by HurricaneRZA View Post
Mean Max created Chuck Norris with some spare parts, two trac bars and some differential fluid.
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post #3 of 6 Old 10-24-2013, 10:25 AM
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi
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no idea man. my 87 came with the 231 and the wife's 93 had a 231 in it also.

I don't feel like working on anything, at this time.
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post #4 of 6 Old 10-24-2013, 11:23 AM
ninjakid
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1987 YJ Wrangler 
 
Join Date: Mar 2011
Location: Chalfont
Posts: 1,018
Don't know if it will be of help but here's my 87's 231 shift linkage and part numbers for the different linkages.
Attached Thumbnails
1382635356693.jpg   1382635367547.jpg  

Incompetence in motion
96 XJ 4dr, 4.0, AW4, NP231,
87 Wrangler, 4.2, TF999, NP231
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post #5 of 6 Old 10-24-2013, 11:25 AM
ninjakid
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1987 YJ Wrangler 
 
Join Date: Mar 2011
Location: Chalfont
Posts: 1,018
Lets try that second pic again...
Attached Thumbnails
1382635523118.jpg  

Incompetence in motion
96 XJ 4dr, 4.0, AW4, NP231,
87 Wrangler, 4.2, TF999, NP231
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post #6 of 6 Old 11-02-2013, 05:15 PM Thread Starter
jeepguy85
Web Wheeler
1987 YJ Wrangler 
 
Join Date: Jan 2009
Location: Kingsport, Tennessee
Posts: 1,153
So I did the NP207 to NP231 swap today. I encountered the following issues:

I had to remove one of the mounting studs on the NP231 because the BA10 tranny only had 5 bolt holes to attach the transfer case.
The shifter linkage is too short. I am going to have my buddy lengthen it tomorrow.
I had to lengthen a vacuum hose about 12".
The front axle output yoke was not threaded for the old bolts and u bolt strap so I bought a new u bolt strap with long bolts and installed them with lock nuts.

Other than that, no issues. I can confirm that the bolt pattern and clocking on the transfer cases were the same. The drive shafts installed without issues. The shifter linkage kit bolted right up without issues. The 4wd engages as it should. The swap is relatively straightforward. If any one else is doing this swap and has questions, hit me up. I could not find a lot of information about this swap on the forum, so I will gladly help anyone considering doing it. I should point out I installed an NP231 AMC transfer case.

Quote:
Originally Posted by Exparrot View Post
"When Chuck Norris drives, Chuck Norris controls the radio..."
Quote:
Originally Posted by HurricaneRZA View Post
Mean Max created Chuck Norris with some spare parts, two trac bars and some differential fluid.
jeepguy85 is offline  
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