serious clunking noise - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-27-2013, 10:06 PM   #1
Jeeper
 
4.2sahara's Avatar
 
Join Date: Sep 2012
Location: lexington va
Posts: 21
serious clunking noise

randomly I will get a very loud very hard bang from my drivetrain. it seems to me that its coming from my transfer case. it feels like its coming out of 4wd at 40mph but I have adjusted the linkage 100 times and still no change I thought maybe it was catching or something but no luck. I recently installed a permanent lock on the front axle I got sick and tired of the vacuum stuff and it didn't start this till after the install.

I checked all the fluids when I installed and topped them up (t-case, trans, front and rear axles).

I do know that with the permanent lock installed the front driveshaft will turn when going down the road and that since this isn't a normal operation that's possibly what caused the problem to surface. Im thinking t-case chain. ive checked the u joints, wheel bearings....everything can check without unbolting anything.
the trans has 70-80000 on it and as far as I know the t-case is original with 240000?
Im fairly new to jeeps ive been researching this problem for a while now and nothing fit the suit. any help is appreciated.
89 sahara np231 ba-10(I know...) factory dana's

4.2sahara is offline   Quote Quick Reply
Old 12-27-2013, 10:38 PM   #2
Jeeper
 
Join Date: Jun 2013
Location: SLC, Utah
Posts: 72
When I bought my YJ I had a pretty heavy clunk when I would hit a bump. Turns out my rear track bar mount on the axle was broken, leaving the bar free to smack the crap out of the rear axle. I simply removed the track bar and the clunk went away.

Bad Cornflakes is offline   Quote Quick Reply
Old 12-28-2013, 08:29 AM   #3
Jeeper
 
4.2sahara's Avatar
 
Join Date: Sep 2012
Location: lexington va
Posts: 21
ive already dealt with that clunk haha I took it off
it only does it in a pull and randomly then
4.2sahara is offline   Quote Quick Reply
Old 12-28-2013, 11:10 AM   #4
Jeeper
 
markgrozYJ's Avatar
 
Join Date: Sep 2013
Location: Niagara Falls/Buffalo
Posts: 282
Quote:
Originally Posted by Bad Cornflakes View Post
When I bought my YJ I had a pretty heavy clunk when I would hit a bump. Turns out my rear track bar mount on the axle was broken, leaving the bar free to smack the crap out of the rear axle. I simply removed the track bar and the clunk went away.
Literally the exact same thing was wrong with mine. It provides a pretty obnoxious bang
__________________
Stock, and saving!

95 YJ Sahara 4.0, 73,000 original miles, stock leafs, 31x10.5" Dunlop Mud Radial tires, 1.25" Spidertrax wheel spacers
markgrozYJ is offline   Quote Quick Reply
Old 12-28-2013, 11:34 AM   #5
Supporting Member

WF Supporting Member
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,889
Quote:
Originally Posted by 4.2sahara View Post
ive already dealt with that clunk haha I took it off
it only does it in a pull and randomly then
Could be a busted trans mount, that would cause all of your symptoms. Could be a ujoint, or worse case could be your rear differential about to die.
__________________
I'M FLEXY AND I KNOW IT

95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, Safari Snorkel, Warn VR8000 Winch, Smittybuilt front Bumper, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo
OverkillYJ is offline   Quote Quick Reply
Old 12-28-2013, 02:16 PM   #6
Jeeper
 
4.2sahara's Avatar
 
Join Date: Sep 2012
Location: lexington va
Posts: 21
Is the t case chain a possibility or am I way off course? I hope it's not the diff that would be a killer on me right now
4.2sahara is offline   Quote Quick Reply
Old 12-28-2013, 02:24 PM   #7
Jeeper
 
TigWizard's Avatar
 
Join Date: Sep 2013
Location: S.W. Ohio
Posts: 459
I had some egged out bolt holes on the shock mounts. When I repaired the mounts, the clunks went away.
__________________
91 2.5 5 spd
Stock, for now
216,000 miles
A work in progress
TigWizard is online now   Quote Quick Reply
Old 12-28-2013, 02:27 PM   #8
Jeeper
 
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,291
Does this happen on turns or going straight, accel or decel?
__________________
2013 WRANGLER SPORT 2 DR., V-6 ,AUTO,HARD TOP
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
Garyk is offline   Quote Quick Reply
Old 12-28-2013, 05:42 PM   #9
Jeeper
 
4.2sahara's Avatar
 
Join Date: Sep 2012
Location: lexington va
Posts: 21
straight or in turn a turn and accelerating. I installed new trans mounts and engine mounts. I don't think its the u-joints I check them they are all good and if it were a joint wouldn't it be consistent? and its completely random but when it does it does it 3-4 times and then no more till next time
just for reference have you ever driven down the road at 35-40 or so in 4wd (childish I know) and it comes out of 4wd? that's what it feels like
4.2sahara is offline   Quote Quick Reply
Old 04-26-2014, 06:27 AM   #10
Newb
 
Join Date: Apr 2014
Posts: 1
Did you ever figure this out? Mine just started doing the same thing this morning. Very loud hard clunck/bang coming from the drivetrain. Feels just like its popping out of 4wd at 40mph.
95yjflexxer is offline   Quote Quick Reply
Old 04-27-2014, 03:33 PM   #11
Jeeper
 
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 2,100
Send a message via Yahoo to Nubby55
I'd pull the back cover off my Transfer case an check or change the chain. You can do this from under the Car with out pulling the transfer case out!
__________________
The Government can not give anything to anybody that it does not first take from someone else !
Nubby55 is offline   Quote Quick Reply
Old 04-28-2014, 08:27 PM   #12
Jeeper
 
4.2sahara's Avatar
 
Join Date: Sep 2012
Location: lexington va
Posts: 21
I installed a new chain and that didn't help. I removed the front driveshaft that didn't help. I rebuilt the rear diff, greased everything, changed fluids; no help! I had my t-case apart and found some small pieces of plastic like a spacer or bushing. I believe my problem is in the main drive in the t-case. I just bought another jeep to build. Take 2 and make one. I'll rebuild the tcase and hopefully that helps. I'll keep everyone posted

4.2sahara is offline   Quote Quick Reply
Reply

Tags
clunk , loud , np231 , transfer case

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 09:42 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC