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Unread 12-24-2010, 03:15 PM   #1
amefford
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1998 ZJ 
 
Join Date: Dec 2010
Location: Alburnett, Iowa
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"Knock" or "Clunk" coming from my rear right...

Whenever I drive over a bump, I hear a clunk or knock coming from my right rear. Ive heard it could be brakes, cat, exhaust hangers, O2 sensor, and heat shields. But, I wanted to know if someone else actually knows what it is? I have the 5.2 V8, I dont think it could be the exhaust, I had the shop recheck the welds on my new pipe, cat, and glass-pack. The cat is still original though...

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Unread 12-24-2010, 03:40 PM   #2
ratmonkey
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climb under there and look for loose stuff. there is no other way to diagnose a clunk. get to it.
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Unread 12-25-2010, 03:55 AM   #3
lateralus3
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i used to have the same noise. it ended up being the tailpipe where it goes up over the axle it was hitting the the trackbar and the gas tank skid
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Unread 12-25-2010, 08:26 AM   #4
newfieZJ
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Shock bushings , or control arm bushings . More details please , is it only noticed on bumps ?
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Unread 12-26-2010, 10:53 PM   #5
cologc46
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I have the same problem, a right rear clunk noticed only on bumps. I looked over both the shock and control arm bushings, and did not see any problems. My RE super ride control arms are only one season old, so the bushings should be good. I was thinking it is either exhaust or maybe the spring. Maybe I need a new spring isolator between the spring and the frame?

Other ideas?
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Unread 12-27-2010, 03:41 AM   #6
newfieZJ
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Quote:
Originally Posted by cologc46 View Post
I have the same problem, a right rear clunk noticed only on bumps. I looked over both the shock and control arm bushings, and did not see any problems. My RE super ride control arms are only one season old, so the bushings should be good. I was thinking it is either exhaust or maybe the spring. Maybe I need a new spring isolator between the spring and the frame?

Other ideas?
The upper RE arms could still be in question . Depending on when they were made , they may have the "bad" bushings that RE has offered free replacement on .

CA bushings's
track bar bushings
shock rubbers
make sure the springs aren't catching on the bump stops
loose parts like exhaust

Not much else back there
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Unread 12-27-2010, 05:47 PM   #7
cologc46
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Yep, I already had to replace the front upper bushings. Those blew out in less than one season and were definitely from the bad batch of RE rubber bushings. I *had* super ride front uppers, super flex rear uppers. When the front uppers blew out, I got some new rubber bushings, and bought some new flex uppers. I put in the flex uppers first, and find those are just fine for me. I will leave those in there, since front control arms are a major PITA to remove and reinstall.

The rear uppers I installed are ball joint, super flex, type control arms. I looked at all the rubber end bushings and did not see any problems, but then, sometimes a simple visual inspection will not reveal that a bushing is blown out.

Thanks for the list, I will run through all of them and look.

Quote:
Originally Posted by newfieZJ View Post
The upper RE arms could still be in question . Depending on when they were made , they may have the "bad" bushings that RE has offered free replacement on .

CA bushings's
track bar bushings
shock rubbers
make sure the springs aren't catching on the bump stops
loose parts like exhaust

Not much else back there
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