NP231 Problems...I Think - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 07-17-2007, 05:41 AM
Posts: n/a
NP231 Problems...I Think

I think my t-case is on its last leg. When i slow down on the highway and sometimes in town it makes a clicking sound. It sounds like the chain is skipping off the bottom of the case. I have heard that the NP231 is somewhat notorious for the chain stretching, sounds like that could be my problem. I am just guessing about the t-case chain, it is hard to pinpoint the noise but it sounds like the t-case. Is my diagnosis reasonable? Any other thoughts? Also assuming the t-case is bad should I try to rebuild it or just replace it. Any leads on a cheap NP231 replacement would also be appreciated. Any info/opinions are welcomed. Thanks.
Sponsored Links
post #2 of (permalink) Old 07-17-2007, 11:12 AM
Join Date: Oct 2003
Location: Temecula, CA
Posts: 294
Thanks: 0
Thanked 0 Times in 0 Posts
If the chain is stretched enough to be hitting the bottom of the tcase, then there will be metal shavings in the oil....

Drain the oil and see what you get. The chain is fairly easy to replace.

"And then I said, 'Just like that, but with more gas!' Oops..."
peteyg is offline  
post #3 of (permalink) Old 07-17-2007, 09:02 PM
Keyboard Implanted
Rio_Grande's Avatar
Join Date: Jun 2000
Location: Southeastern Indiana
Posts: 4,767
Thanks: 3
Thanked 2 Times in 2 Posts
I would be really supprised to find out that a 99 tj had a streached chain. Last one I fixed was a beat to death 88. It was the first time the case was opened. Not saying it couldn't be, but I expect that it is not the chain. Go through and check all the fluids, Heck replace it if it is time and look for shavings as suggested and discolored oil. While changing the chain is not difficult it requires a few special tools and While I could do it in about 3 hours (I like to do it on a bench) I wouldn't want to do it unless absolutely necessary.

Berings going out tend to tick as described. I would make sure what was wrong before I threw parts at it.


Ya only go around once, best to enjoy it the first trip.
Rio_Grande is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

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