Drive Train Rattling Noise - Second Opinion -
LinkBack Thread Tools
post #1 of 2 Old 06-12-2013, 09:25 PM Thread Starter
Registered User
LimeLJ's Avatar
2004 LJ Wrangler 
Join Date: Dec 2010
Location: Location
Posts: 856
Drive Train Rattling Noise - Second Opinion

1997 Jeep Comanche - 4.7L, AW4, NP231, D44 Rear
Assume everything has 412 miles on it except for the the transmission and transfer case which are both are about 220,000 miles.

Transfer is in 2WD and the front drive shaft is removed since it needs the centering ball rebuilt before being reinstalled. No linkage hooked up either.

There is a rattling noise between drive and deceleration during coasting when the drive shaft is best described as unloaded. It sounds like a dragging chain.

My initial finding was that the drive shaft was built with a low clearance yoke at the transfer case causing it bind at 12 of u-joint angle. It normally rides 10*to 12. I remedied that by swapping the high clearance slip yoke from a spare XJ drive shaft to get a maximum of 20 of clearance.

The noise initially seemed to be gone, but modulating to keep the drive shaft unloaded brings the noise back. It just seems that the new drive shaft with the wrong yoke helped to make me aware of the issue.

I am fairly sure it is a loose chain or a bad bearing in the transfer case since the noise is coming from the transfer case area right next to the driver's seat. Though I have other mechanic friends telling me it is probably not that. Thus, second opinions from those with experience with kind of situation?

LimeLJ is offline  
Sponsored Links
post #2 of 2 Old 07-27-2014, 03:44 PM Thread Starter
Registered User
LimeLJ's Avatar
2004 LJ Wrangler 
Join Date: Dec 2010
Location: Location
Posts: 856
NP231 was replaced with a rebuilt NP242. Chain noise is obviously gone, but the rattling when the engine is unloaded it still there.

2004 Jeep Wrangler Unlimited
1997 Jeep Comanche - 4.7L Stroker, Lifted, "Restored", and soon to be supercharged.
LimeLJ is offline  

Quick Reply

Register Now

In order to be able to post messages on the 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 e-mail address for yourself.

Email Address:


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

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