Transfer Case Expert needed! NP231j 231 - JeepForum.com
 
LinkBack Thread Tools
post #1 of 6 Old 12-15-2009, 07:09 AM Thread Starter
eric411420
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2009
Location: Arizona
Posts: 79
Transfer Case Expert needed! NP231j 231

I have searched and searched for a long time and can't find an answer to a few of my questions.

I have a 94 YJ, 4.0, Manual trans, NP231j.

I noticed a clicking noise upon deceleration regardless of whether the clutch is in or out, trans in gear or neutral, doesn't matter. It makes the clicking in all those situations. It is vehicle speed dependent. I would roughly say that I have to be moving 25-30 mph before it will make the noise (I want to stress that it SEEMS that is the case but it is possible that I can't hear it at lower speeds). HERE, is what should be most helpful; If I put the Transfer case in Neutral, put the transmission IN GEAR (5th yields the best results) with the engine running I can hear it really well. I crawled under it and stethescoped the trans and the tcase in every spot possible and I have located the area that the noise is most prevalent. It is at the bottom of the case about an inch or so from the detent plunger/spring cap, toward the centerline of the case. I have taken the case apart for inspection and I have not found anything that is obviously wrong. PLEASE HELP!

I have some other questions relating to this issue but I don't want to get this thread sidetracked. I also think that my other questions are such that others could benefit from the answers greatly in the future so I am going to post them in a separate thread. If you see that, just realize that I am not over-posting the same thing. I am doing it to hopefully help others in their future searches as it would have been extremely useful info to me.

Thanks in advance!

Eric


When seconds count, the police are only minutes away.
eric411420 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 12-15-2009, 09:02 AM Thread Starter
eric411420
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2009
Location: Arizona
Posts: 79
I also meant to say that there is no sign of the chain contacting the case as well. What parts are moving inside the case when it's in neutral with the trans in gear? I have dana 44's and manual hubs. I am correct that vacuum issues only apply to the stock diff and not the tcase? The P.O. installed an SYE but also left out the magnet and detent plunger spring. I now don't trust much in this case.

When seconds count, the police are only minutes away.
eric411420 is offline  
post #3 of 6 Old 12-15-2009, 09:14 AM
TSEJEEPERS
Web Wheeler
 
TSEJEEPERS's Avatar
1993 YJ Wrangler 
 
Join Date: Dec 2003
Location: Morton IL
Posts: 5,462
Are you sure the noise is coming from the transfer case and not the driveshaft? Maybe you have a u joint going out.

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
TSEJEEPERS is offline  
post #4 of 6 Old 12-15-2009, 10:15 AM
rosco_dog
Registered User
1990 YJ Wrangler 
 
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 15
Quote:
Originally Posted by eric411420 View Post
HERE, is what should be most helpful; If I put the Transfer case in Neutral, put the transmission IN GEAR (5th yields the best results) with the engine running I can hear it really well.
did you reinstall a spring? it's there to keep the shift fork in the right spot. this might be your problem. I'm assuming the above test was done with the jeep parked and not driving? So that would rule out ujoints.

'90 YJ, 350/700R4/231CJ swap in progress, stock axles currently with 4.88's and 33's
rosco_dog is offline  
post #5 of 6 Old 12-15-2009, 01:12 PM Thread Starter
eric411420
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2009
Location: Arizona
Posts: 79
Quote:
Originally Posted by rosco_dog View Post
did you reinstall a spring? it's there to keep the shift fork in the right spot. this might be your problem. I'm assuming the above test was done with the jeep parked and not driving? So that would rule out ujoints.
The spring is definitely in there and you are correct, the jeep was stationary. The rear shaft, cv and u-joints are new and it was just balanced.

What is in motion inside the tcase when it is in neutral but the trans is in gear and rotating? The only thing I have not taken out is the planetary gear drive. I can grab it and there is a little play. How much play is normal?

When seconds count, the police are only minutes away.
eric411420 is offline  
post #6 of 6 Old 12-15-2009, 11:33 PM
rosco_dog
Registered User
1990 YJ Wrangler 
 
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 15
i had the same problem once, i sold the jeep before i could figure it out though. i sent you a pm.

'90 YJ, 350/700R4/231CJ swap in progress, stock axles currently with 4.88's and 33's
rosco_dog is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Np231j transfer case trouble shooting Blackfish YJ Wrangler Technical Forum 10 08-15-2014 02:27 PM
Transfer Case lowering kit needed? thegreatnardini YJ Wrangler Technical Forum 15 07-14-2008 01:37 AM
Trans/Transfer case needed docneon TJ Wrangler Technical Forum 1 02-28-2008 06:33 AM
Replace YJ Transfer Case NP231J jeephobbie57 YJ Wrangler Technical Forum 11 07-21-2007 05:01 PM
more transfer case info needed PLEASE! cutlass1972 TJ Wrangler Technical Forum 3 12-21-2006 08:21 AM

Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are On
Refbacks are On

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