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Old 04-22-2008, 04:25 PM   #1 (permalink)
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t-case making aweful noise?

hey everybody

ive got a friend with a cherokee and were trying to get it ready to do some wheeling this summer and the only problem were having is with the t-case. other then that its a perfect wheeling rig so were trying to get this straight. it worked fine for a few months, then all of a sudden he went to put it in 4wd one day, and it makes a grinding/slapping noise. ive installed a couple SYEs before in the 231, so i know my way around that t-case fairly well, but before i pull it apart i want to have a general idea of what im looking for

at first i thought it was a loose chain rubbing the case, and then slapping. but then i thought about it, and it ONLY does it in 4hi/low. but then i got to wondering. does the chain always spin, or only in 4wd. what are some other parts that become engaged in 4wd that could make this noise?

thanks
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Old 04-22-2008, 06:16 PM   #2 (permalink)
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I just swapped out my NP231 in my TJ. My chain had slack and was slapping against the case, and yes this does happen in 2WD. I decided I was just going to buy a replacement NP231 swap it out and then rebuild the old NP231 and resell it to get some of the money back. Swapped in the new case and saw a huge gash in the side of the old case, the chain had actually worn a hole in the side of the case.
I would recommend doing the same, if you have the cash to do so. Its not worth it to pull the case and find out its worthless, the NP231s are soo cheap you can buy one with a SYE already installed for like $300, with low miles. That way if the old case is still salvageable you can fix it and resell it.

Another thing to consider, is the shift fork. I have heard that they have a tendency to bend inside the case... causing a similar sound when trying to go into 4WD, but you have to tear into the case to find out. Anyway, this might not be the answer you were looking for but I thought it might be helpful to share my NP231 experience.
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Old 04-22-2008, 09:02 PM   #3 (permalink)
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so the chain does spin all the time..even in 2wd?

i thought it only spun in 4wd which would explain it being the chain, but if it spins all the time then im clueless

thanks for the help though
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Old 04-23-2008, 06:24 AM   #4 (permalink)
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Quote:
Originally Posted by iwishihad1 View Post
so the chain does spin all the time..even in 2wd?

i thought it only spun in 4wd which would explain it being the chain, but if it spins all the time then im clueless

thanks for the help though
Unless you have selectable hubs, the front wheels are driving the chain when in 2 wheel drive...
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Old 04-23-2008, 06:26 AM   #5 (permalink)
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the NP231s are soo cheap you can buy one with a SYE already installed for like $300, with low miles.
Where?...
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Old 04-23-2008, 07:06 AM   #6 (permalink)
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well it makes absolutely no noise in 2wd so i guess we can eliminate the chain....could it be the cog gear bearings?
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Old 04-23-2008, 04:53 PM   #7 (permalink)
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Quote:
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Where?...
I got mine for $300 i think, plus shipping and it only had like 35k miles on it, with Advance Adapters SYE already installed. It took some searing and allot of posting on lots of different forums, but it certainly can be found and sometimes even cheaper if you get one with a hack-n-tap SYE instead of full tail housing replacement. To answer your original question, I think I ended up getting finding it on Jeeps Unlimited forum.
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