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Unread 12-29-2014, 11:00 AM   #1
modfox
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Exhaust rubbing front driveshaft when turning

When I turn right my exhaust rubs my front driveshaft. Just started making this noise.
Only does it when I turn right. Motor mounts appear to be fine. What would cause this?
95 YJ 4.0 4" lift 33" tires

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Unread 12-29-2014, 11:28 AM   #2
LoneYJranger
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A loose exhaust tube
Take a look above the rear differential, the exhaust should be attached there to the frame, if not then you need to reattached
How you know that your exhaust is the one rubbing and not something else?
Any pics?
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Unread 12-29-2014, 11:34 AM   #3
modfox
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Yes it is the exhaust rubbing. Here is a pic. Exhaust sits about half inch from front shaft.
image-740863555.jpg

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Unread 12-29-2014, 11:35 AM   #4
LoneYJranger
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Then is loose on the back attachment, check it out
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Unread 12-29-2014, 11:41 AM   #5
sardog211
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Wow that's close I had same issue, I had to loosen exhaust bolts and move it over, I ultimately took it to muffler shop and the exhaust rerouted to fix PO's hack job on exhaust system.
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Unread 12-29-2014, 11:43 AM   #6
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Everything is tight. I had a cat back installed about 6 months ago. I may have to take it back and see what they can do. I will try to loosen bolts and see if it moves.
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Unread 12-29-2014, 11:50 AM   #7
fishadventure
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Look at the rear spring eye bushings that mount to the frame ears for one, and especially the tranny mount. When the tranny can wallow around letting the motor stretch the motor mounts you can get some weird contact. This has been an issue I have seen several times now.

On the plus side it looks more - and sounds more- like body roll with too little clearance anticipated on the pipe install.
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Unread 12-30-2014, 07:09 AM   #8
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I will look at those frame eye bushings mounts today. If they are bent can't he be bent back into position? Or do you mean the actual bushing I those mounts?

Thanks for the info.

These noises did start after a day on the trails.
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Unread 12-30-2014, 08:32 AM   #9
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If it just started you probably just moved or broke a mount; the one right under the skid plate by the cat is a common place for failure.

I was having that trouble with the stock exhaust and with the header after putting on a tom woods drive shaft with a larger tube size. The original YJ front shaft with an auto transmission is only about one inch in diameter. I fixed it by routing the whole thing around the front, TJ style.







It's not nearly as close to the starter as it looks
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Unread 12-30-2014, 08:35 AM   #10
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Quote:
Originally Posted by jbolty View Post
If it just started you probably just moved or broke a mount; the one right under the skid plate by the cat is a common place for failure.

I was having that trouble with the stock exhaust and with the header after putting on a tom woods drive shaft with a larger tube size. The original YJ front shaft with an auto transmission is only about one inch in diameter. I fixed it by routing the whole thing around the front, TJ style.


It's not nearly as close to the starter as it looks
x2. Mine started rubbing when the exhaust mount by the cat broke. I fixed it by installing an old TJ exhaust. Much better clearance
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Unread 12-30-2014, 08:56 AM   #11
1320yj
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Make sure that the mount for the catalytic converter is still in place. There is a bracket that holds the cat up in place without that it allows the exhaust to sag a bit and the front of the pipe rotates over and hits the front drive shaft. Had the same exact problem
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Unread 12-30-2014, 10:43 AM   #12
fishadventure
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Quote:
Originally Posted by modfox
I will look at those frame eye bushings mounts today. If they are bent can't he be bent back into position? Or do you mean the actual bushing I those mounts? Thanks for the info. These noises did start after a day on the trails.

I meant the actual bushings themselves- mine were so bad they pushed the DS into the tranny and ruined the tranny mount too. And hard acceleration or quick braking would cause a lurch and rapid direction change. The rubber was shot because the steel sleeve on the bushing had rusted away completely.
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Unread 12-31-2014, 12:48 PM   #13
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So the bushings are good. And it appears that the trans mount is also good. I went ahead and bought a new trans mount. I will put it on tomorrow. All of the exhaust hangers appear to be attached.
If I loosen the exhaust at the manifold can I move the exhaust over? Or is there no adjustment from the exhaust manifold?
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Unread 12-31-2014, 01:13 PM   #14
bpounds
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When did you install your lift? And are you running a front track bar?
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Unread 12-31-2014, 02:22 PM   #15
1320yj
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Loosen the 2 nuts that hold the front exhaust pipe on and raise the cat and muffler up then tighten up the 2 nuts.
I had to bent the bracket down that welds to the front pipe a bit to help keep the cat and muffler up enough for clearance.
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