thump/knock noise in drive line I think. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > thump/knock noise in drive line I think.

Savvy Billet LED Tail LightsLight up the holidays with LED lights from JeepHutIntroducing MONSTALINERô UV Permanent DIY Roll On Bed Line

Reply
Unread 11-20-2013, 11:10 PM   #1
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 3,083
thump/knock noise in drive line I think.

Its a sporadic noise seems to increase in speed while accelerating seems like its coming from the front and i can faintly feel it in my feet. The ODD time I feel a very slight vibration (like 7 or 8 vibrations then stopps and repeats like that). I just took a buddy for a drive to let him hear it and it would not do it. Im thinking the front axle ujoints?

xcaliber81 is offline   Reply With Quote Quick reply to this message
Unread 11-20-2013, 11:30 PM   #2
JasonStebbins
Registered User
1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Axle or drive shaft U-Joints would be the first thing to check. Tire out of round. Bent wheel. Wheel bearing. Harmonic balancer.

Check the axle U-joints for play, you can do this without jacking it up. Check the drive shaft joints for play (put the transmission in neutral) or you can try taking the shaft off completely to see if the vibration goes away. Jack up the tires and push/pull to test the hub assembly. As far as the tires and wheels, if nothing else fixes it then go that route.
JasonStebbins is offline   Reply With Quote Quick reply to this message
Unread 11-20-2013, 11:38 PM   #3
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 3,083
Sometimes when im parked on a hill I hear a clunk in the rear im guessing thats the rear ujoints? does not do it on a flat surface only on a hill.

Is it normal for a ujoint thats in its early wear stages to intermittently make that sound and vibrate? and the fact that its intermittent would that not rule out the tire/wheel? I was thinking of the wheel bearings too but i can faintly feel it on the front floor by my feet or will the unibody radiate the feel?
xcaliber81 is offline   Reply With Quote Quick reply to this message
Unread 11-21-2013, 12:27 AM   #4
JasonStebbins
Registered User
1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Are you sure it's a rear clunk or the transmission slamming into gear? I always dread parking on a steep incline without a working E-Brake. Put it in neutral and move both drive shafts in every direction at the joint, any movement is a bad thing. Could also be the slip joint has no grease in it where the shaft enters the transfer case.

Being intermittent in general is strange if it's a moving/rotating part. I was just throwing out what could cause a vibration.

The drive shaft is closest to the floorboard at your feet, I would start there. Wheel bearings are easy to check for regardless.
JasonStebbins is offline   Reply With Quote Quick reply to this message
Unread 11-21-2013, 12:32 AM   #5
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 3,083
well now that you say that im not sure if its a rear clunk of the trans slamming into gear lol, ill assume its the trans slamming into gear cause it only happens on a hill. My ebrake needs adjusting and I have just put it off and im not really sure why haha.
xcaliber81 is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.