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Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Something's "clunking" under the jeep!

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Unread 08-23-2012, 07:13 AM   #1
cgseanp
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Something's "clunking" under the jeep! Update post 15

Morning!

For as long as I've had my jeep (only been 3 or so months now), I've had this clunking or banging noise under the jeep, usually happens when I back up and then stop, but I guess it also happens when I'm just driving and then slow down or stop. At first I thought it was normal, maybe do to having a lift or something (don't know a whole lot about Jeeps).. Anyways, to better describe what it does here's an example..

Backing out of driveway and when I use the brakes, something underneath moves and bangs up against the floorboard. I can't tell if its drivers or passengers side, but it's fairly loud. It's like something down there is suspended, but not bolted down, so as I take off or stop, it is swinging around. I'm sure somebody knows what this is! Help me out! thanks

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Unread 08-23-2012, 07:17 AM   #2
Jeepsr4me
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Get under there and grab the rear of the transfer case and lift up and down see if it moves a good bit, but my bet is the trans mount.
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Unread 08-23-2012, 07:18 AM   #3
Dragonwitch
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we had a clunking noise that turned out to be the rear sway bar wasn't attached to anything...bracket on the axel had broke
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Unread 08-23-2012, 07:24 AM   #4
cgseanp
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Thanks for quick replies.. so, if it is the Trans mount, is this an easy fix? Is it just that a bolt broke and needs to be reattached, or is something actually broke? Thanks!
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Unread 08-23-2012, 07:41 AM   #5
Jeepsr4me
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Just get under there. You will know more and we will be able to help you a little better.
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Unread 08-23-2012, 07:49 AM   #6
cgseanp
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roger, well ill report back when i can get down there!
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Unread 08-23-2012, 09:18 AM   #7
sdotcarter
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Could be the exhaust too
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Unread 08-23-2012, 10:21 AM   #8
cgseanp
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Havn't been able to check yet, but I do think there may be something lose with the exhaust as it rattles sometimes so Ill check that out also
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Unread 08-23-2012, 10:21 AM   #9
seattle_yj
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Same problem was happening to me for a long time, just got around to fixing it this week.

Like Jeeps4m and sdotCarter were saying, my issue was a mixture of worn trans mount and tcase insulator arm (aka isolator arm, pin, etc) and the cat was clinking against the skid plate.

The transmount is an easy fix. I bought a part from napa for $23 but you can buy it cheaper here: http://www.quadratec.com/products/56003_0024.htm

The insulator arm is a main culprit here because it is not always put back correctly when the skid plate is removed. I also replaced this "pin" and the bushings. The parts I used are here: http://www.mountainoffroad.com/_e/Je...2_95_Jeeps.htm

The cat issue smacking against the skid plate was fixed by installing a new exhaust found here: http://www.jeep4x4center.com/exhaust...tor-35460.html
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Unread 08-23-2012, 11:01 AM   #10
Luuca
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Mine would do the same as the OP. It was the Transmission mounts. Funny enough, I just recently heard an exhaust rattle as well, looked around under there, and found one of my hangars had come out. The rubber bushing inside the rear hangar mount was bad. My local muffler shop had a bushing that worked and $10 later, they had it installed and hung properly.

Welcome to the wonderful world of YJs.. you'll soon learn how to listen, feel, and smell your way into vehicle diagnostics.
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Unread 08-23-2012, 12:09 PM   #11
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Quote:
Originally Posted by Luuca View Post
Welcome to the wonderful world of YJs.. you'll soon learn how to listen, feel, and smell your way into vehicle diagnostics.
Amen to that.

When someone's riding with me and asks, "what's that noise/smell/etc" I can almost always come right back with an answer. Over time we become very intimate with our rigs. LOL
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Unread 08-24-2012, 07:09 AM   #12
cgseanp
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well I got under my jeep and apparently I don't even have the transmission mount. I could be wrong, but I was checking out the skid plate and there is only one bolt going through the plate (not counting the 6 holding it up) and i thinik it is the " torque arm stud" from looking at the FAQ section. So, no other bolts coming through would equal no transmount? or a broken one? I'm going to try to get to it this weekend if I can find a part local, otherwise Ill order it and do it when I can.
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Unread 08-24-2012, 07:16 AM   #13
sdotcarter
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Yea I'd be easy on driving it too. Any parts store will have it.
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Unread 08-24-2012, 10:48 AM   #14
seattle_yj
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Here is a pic of my skid plate. If your missing the two 'trans mount' bolts, that would be bad. When you look at the part, they are actually studs that protrude from the rubber. They could have been over torqued and maybe pulled out of the bottom. Oh well, easy enough fix.
skid_plate.jpg  
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Unread 08-27-2012, 01:25 PM   #15
cgseanp
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I went out and bought a new trans mount and installed it this weekend.. Unfortunately, I DID have a trans mount, but for some reason mine looks a little different then in the pictures. The two trans mount bolts don't stick out as far as in this picture, they are almost flush with the skid plate. The area of the skid plate that the bolts go through is like recessed a little, so that's why the bolts don't stick out past the skid plate. Anyways, like I said, I did have a mount already, but I still went and changed it since it looked old and was only a 20$ part. Problem not fixed though. It's hard to tell, but this morning I thought the banging noise came from passenger side in the back.. Maybe it is my exhaust moving around, but I pushed on it and couldn't really tell if it would move or not when I was driving.
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