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Old 04-30-2007, 07:34 PM   #1
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Angry *#%& clanging noise....

I have clanging in rear of 88 YJ. When I first got jeep, I only noticed it after a hard brake pedal. Got pissed at it, slammed on brakes and now it does anytime I lift off gas or touch brakes and it is much, much more noticable. I have replaced, UV joint, built complete new rear brakes. I thought might be somewhere in the brakes, but nnnoooooooooo......

Since I had top, doors and tailgate off today I was really able to hear and it is coming from rear end. The drive shaft could also still be a possibility. Something is definitely loose.

Any suggestions?

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Old 04-30-2007, 08:16 PM   #2
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also check inside your rear diff, possibly muffler/tail pipe also.

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Old 04-30-2007, 08:56 PM   #3
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When I got mine I had a funky rattle whenever I gave it gas. Muffler was shot and the hanger brackets for the muffler and tailpipe had broken welds. It made more noise cornering, too.
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Old 05-01-2007, 05:57 AM   #4
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X2 on Muffler, Cat or both.
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Old 05-01-2007, 02:29 PM   #5
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Thanks for the advise, I will check those things tonight. The noise is really more of a clanging, loose, about to break kinda noise.....hopefully, I'll find it tonight.

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Old 05-01-2007, 03:27 PM   #6
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Take a hammer and hit everything that could be loose. Then it'll all be loose and you'll know what to fix.
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Old 05-01-2007, 04:47 PM   #7
coilovers are damn flexy
 
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A universal joint, gone bad, will also give you some sounds like that. It is also a very cheap fix, if you replace them before they break.
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Old 05-02-2007, 11:15 AM   #8
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I was thinking maybe a bad bushing somewhere. When you let off the gas or hit the brakes the suspension will move, but then again you would hear it anytime the suspension moved. Can you replicate it by jumping up and down on the bumper? If it is something loose you should be able to rattle stuff around until you find it. Make sure you check the heat shields above the exhaust too.
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Old 05-02-2007, 06:50 PM   #9
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It is really more of a rotating clang. I would compare it to maybe a very loose drive shaft. I just replace universal joint in the rear and it seems to be fairly snug.

Took off differential cover this evening and didn't find anything loose.

I did notice as I was rotating axles that when the universal stoped turning, the transfer case lifted a little at the stop. Maybe 1/4 in. Where are the mounting points for the transfer case so I can check them to be tight?

It looks like I'm going to have to remove the skid plate to access everything. Is there anything I need to know about that?
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Old 05-04-2007, 04:07 AM   #10
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I have a similar noise on my 99 sahara, got under there and the control arm bushing looks spent. I am relpacing it tomorrow, but check all of your bushings get under and shake everything.
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Old 05-04-2007, 07:26 AM   #11
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Could it be a tranny mount gone bad?
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Old 05-04-2007, 08:34 AM   #12
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Gonna check that tonight...........hope thats it.
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Old 05-04-2007, 12:48 PM   #13
coilovers are damn flexy
 
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Your skid plate is the mounting point, for your t-case. When you lower your skid plate, place a ratchet strap around your t-case, and snug it up, between your frame rails. After you secure your transmission, t-case, you can unscrew the bolts, that hold your t-case, to your skid plate. Now you are ready to just unbolt the skid plate, completely, and remove it. You should now be able to detect a worn out t-case, transmission, mount.

As a sub note, when replacing u-joints, it is always best to replace them all, at one time.
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Old 05-04-2007, 04:17 PM   #14
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i had some thing like that happen on my 93 it tured out to be my torque arm bolt on the trany it would twist and my drive shaft would hit the heat shield over the muffler other wise ive got not a clue
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Old 05-04-2007, 05:28 PM   #15
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I am just waiting for him to get around to looking into the possible problems we have identified. Until we get a good report, we can't be very helpful.
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Old 05-05-2007, 12:30 PM   #16
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Well, with a pry bar I can move around a little. Not much. However with a 4 ft piece of wood, I can lift up and move around. I am suffering with Tiny-i-dis. I am refusing to take it to a friend and have him look at it. I am leaving for vacation on Thursday, so I may just leave it.

Should I go ahead and change out mounts? It seems like with the rubber there should be some movement. If rubber is worn out would that allow too much movement?? I wouldn't think that letting off brake and just coasting would cause the drive train to sound like it was coming out....

I am wondering if it is in the transfer case ;-(
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Old 05-05-2007, 12:39 PM   #17
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Needle bearing?
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Old 05-05-2007, 12:52 PM   #18
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Glad you said bearing ;-)

I don't know man, its dtiving me up the wall. I think its more serious that a mount.
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Old 05-05-2007, 02:40 PM   #19
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I sure would like to be writing in the what my jeep did for me today thread!!!
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Old 05-07-2007, 10:53 AM   #20
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Tiny-i-dis

I like that. We should adopt that as a standard expression for being stubborn.

Is there any chance you can put that thing up on jack stands and try to stand outside while someone puts it in gear and try to get an idea roughly where the noise is coming from. At least you can get a little closer and focus your search.
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Old 05-07-2007, 12:04 PM   #21
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I actually had up on stands in garage, put in gear and there was not noise. Hopefully, my buds can figure it out while I'm at beach.....it definitely sounds like something is loose and slapping around. I just can't find it. You would think that it would sound off on the stands but it didn't!!
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Old 05-11-2007, 07:19 PM   #22
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Tail Pipe is rattling against Shackle?

Had muffler replaced today...(3 *$@! Hours....I think they were going for a record!) Anyway.....Drove away only to have a "Clanging" or rattling noise when I let off the gas. Got it home and found tail pipe was installed too close to the shackle.... I bent it away from it and problem solved.
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Old 05-11-2007, 09:29 PM   #23
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Just turn it upside down and shake it, already!!! I want to know what it is. This is taking much too long. How can you go to the beach when a family member is sick?
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Old 06-11-2007, 04:47 AM   #24
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Ever find the answer???

It sounds like have the same problem !
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Old 06-11-2007, 05:53 PM   #25
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hahaha. this is crazy my yj has been making the same noise you have been describing and i have NO idea what it is. i replaced my u-joints about 2 months ago bc they were shot. then my torque arm and transmission mount plate bc they were bad. still gotta noise. i'm thinkin maybe the muffle or something (i slid backward off some rocks and my tail pipe got stuffed with clay which caused the pressure to bolw the weld completely off my muffler. so maybe the muffler is rattling around. i just cant figure it out.
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Old 06-12-2007, 12:19 AM   #26
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I just fixed the clanging in the rear of my 88 YJ. One of the hangers for the tailpipe broke the weld and the tailpipe was shimmying between the gas tank shroud and the rear springs. changed with corners, braking, stopping and starting. I aways carry an extra hanger strap in my emergency kit so I just pulled over and fixed it. My money is on a broken hanger or weld in the pipe itself. It won't show up unless driven or the tailpipe is yanked around a lot.

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