231J jumps out of 4L - JeepForum.com
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post #1 of 4 Old 04-03-2008, 09:54 PM Thread Starter
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2000 TJ Wrangler 
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Location: niceville, fl
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231J jumps out of 4L

I have the np231 transfer case with 2.7? gears. when i put it into 4L it will jump out. sometimes in 2' sometimes half mile. when it jumps out almost impossible to get back in. opened up the transfer case for a SYE install and found one of the forks(the cast aluminum one) has the plastic bushing/guide worn on the rear side almost into the aluminum. gears appear to be in good condition very little wear and no broken/damaged teeth. has 103,000 miles on a DD. any suggestions?

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post #2 of 4 Old 04-04-2008, 12:33 PM
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Location: Medford, MA
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my first guess would be the linkage. I installed a linkage extension bracket with my lift, and now its hard to get it into 4lo and pops out sometimes. By adjusting where on the bracket the linkage mounts, you can fix it. al least for me.

04' Columbia TJ
33" BFG AT's, OME HD lift, front airbag suspension, teralow 4:1 kit & supershort shaft kit, TW CV shaft, 4.10 gears, JKS body lift, track bars and quicker disconects, Warn 9.5ti, warn front bumper, garvin wilderness rack, and solid cast aluminum tusks,
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post #3 of 4 Old 04-04-2008, 01:10 PM Thread Starter
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thought that could be a problem but the np231 has a very strong detent inside the case to hold it into gear. Any other ideas?
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post #4 of 4 Old 04-04-2008, 01:46 PM
Jerry Bransford
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This could be caused by the t-case lever not pulling the t-case all the way into 4Lo. The shifter is known to occasionally pull slightly out of adjustment, out of the bracket where it is held in place by a large set-bolt. When it slips, it slips in the direction that causes problems with 4Lo not staying engaged. Not sure what caused the internal shift fork damage, I don't know if it could be the real cause or just incidental damage.

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