NP231 Shift Linkage -
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Unread 01-17-2007, 11:41 PM   #1
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Join Date: Jul 2006
Location: San Jacinto, CA
Posts: 68
NP231 Shift Linkage

Alright, my transfer case is VERY difficult to shift into anything other than 2Hi, and when it finally does get into a 4WD range (after much grinding) it immediately pops out of gear.

This is very irritating. I'm assuming this is because of the shift linkage based on my searches, but I have no idea what to expect in repairing this (I'm digging into it tomorrow morning). Anyone have any advice about how to properly fix this issue?

(I've already searched, and looked over the FAQ's)

93 YJ 4.0 HO with AX-15, NP231, RE 4" Lift, Stock Axles, BFG 33's, Posi-Lok'd, and Herc'd
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Unread 01-18-2007, 02:54 AM   #2
Joe Dillard
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1991 YJ Wrangler 
Join Date: May 2004
Location: Lexington Park, Maryland
Posts: 13,002
There's a piece of linkage ~2" above my middle finger you can try to adjust.

If you need to replace the NP231 shift linkage, I have mine still & don't need it anymore since I swapped in a different tcase.

I'm in Hawaii right now for the next 3 weeks, but can ship it from my home in San Diego when I return if you need it.

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Unread 01-18-2007, 05:34 AM   #3
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1993 YJ Wrangler 
Join Date: Jan 2005
Location: Albuquerque, NM
Posts: 7,217
Verify your flud level is correct. If so, referring to Joe's pic above, you can just pry-pop the linkage rod off. It is rubber mini-gromet mounted at both ends. Once one end is popped off (the rear is best), you can shift the linkage by hand (probably with channel lock pliers to help) and see if you still have the problem. If you do, it's an internal issue. If you do not, it's a linkage issue. If linkage, that 1/2" bolt on the front end of the linkage rod is an lock bolt. That bolck on the rod slides fore/aft as needed to get the nength right, then is locked down to that length.

Remember, the lever action makes the t-case shifter backwards. Full back is 2hi. Full forward like this pic shows, is 4lo.
'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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