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Unread 01-25-2013, 08:04 AM   #1
homebrwd
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Lets play a game called "What's that noise?"

So I recently installed 1.25in Body Lift and a 1in motor mount lift. There were no noises after this. A few weeks later came the tummy tuck. I chose the UCF Ultra high clearance skid with Low Profile transmission mount. Install went fine but now I am getting a noise and I don't know what it is.

The noise is heard at high speeds (50 and above) but only in certain situations.
1. When the clutch pedal is pressed in
2. When gas is fully released it makes the sound briefly
3. When the glass is pressed from full release it again makes the sound briefly

I had the Jeep up around 55MPH and pressed the clutch and held it in, as the speed went down the noise got quieter, pretty much inaudible after 40-45 MPH (granted I have a loud exhaust). I don't have any vibration at highway speeds.

Here is the video I was able to capture of the sound.
It can be heard at :02 when I press the clutch pedal until :06 when I release the pedal then again at :10 when I press the pedal in again.


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Unread 01-25-2013, 08:46 AM   #2
tyvanwie
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Did you get a SYE and double cardan drive shaft too?

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Unread 01-25-2013, 08:52 AM   #3
homebrwd
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No, UCF said it shouldn't be required, If it was drive shaft vibration wouldn't it be noticeable all the time at high speed not just when the clutch pedal is in?
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Unread 01-25-2013, 09:15 AM   #4
tyvanwie
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I'm not 100% sure so I won't give you false information. But usually those high clearance skids need an SYE and dc.

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Unread 01-25-2013, 09:29 AM   #5
homebrwd
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Its something I am no doubt looking into and thank you for the input, its appreciated.
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Unread 01-25-2013, 09:32 AM   #6
tyvanwie
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I really don't know if that's the problem or not, but it's an idea.

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Unread 01-25-2013, 09:59 AM   #7
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Are you positive it wasn't there before and you're just over sensitive now that you changed something? The noise isn't that loud, but video never does noises justice. What do your pinion angles look like front and rear?
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Unread 01-25-2013, 10:04 AM   #8
homebrwd
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It was no doubt not there before the tuck. Its louder than the video portrays of course.

I didn't have an angle finder at time of install but will be picking one up today to properly measure the angles.

Also want to note that I don't feel any new vibrations while at highway speed. Or when the noise is happening.
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Unread 01-25-2013, 10:56 AM   #9
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Quote:
Originally Posted by tyvanwie View Post
I'm not 100% sure so I won't give you false information. But usually those high clearance skids need an SYE and dc.
Look at his profile, he's still at stock height. Assuming that skid raised his t-case ~3" and the LoPro dropped it 1", he's at a net +2" over stock in terms of driveline angle. Add in the MML and I'm not surprised he's just fine without a fixed yoke and double cardan shaft.

The video is too low quality for me to even begin to hear what sound you're referring to. But I'll assume something is making contact with something else. Get under there and check everything--case, shifter linkage, muffler/cat, exhaust at the control arm mount, engine up at the firewall, etc. Look for contact.

The exhaust shouldn't be an issue at all if you adjusted the hanger @ the trans mount bracket properly.
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Unread 01-25-2013, 11:04 AM   #10
tyvanwie
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Quote:
Originally Posted by Imped

Look at his profile, he's still at stock height. Assuming that skid raised his t-case ~3" and the LoPro dropped it 1", he's at a net +2" over stock in terms of driveline angle. Add in the MML and I'm not surprised he's just fine without a fixed yoke and double cardan shaft.
Yeah, like I said, I wasn't sure.

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Unread 01-25-2013, 11:23 AM   #11
homebrwd
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Quote:
Originally Posted by Imped View Post
Look at his profile, he's still at stock height. Assuming that skid raised his t-case ~3" and the LoPro dropped it 1", he's at a net +2" over stock in terms of driveline angle. Add in the MML and I'm not surprised he's just fine without a fixed yoke and double cardan shaft.

The video is too low quality for me to even begin to hear what sound you're referring to. But I'll assume something is making contact with something else. Get under there and check everything--case, shifter linkage, muffler/cat, exhaust at the control arm mount, engine up at the firewall, etc. Look for contact.

The exhaust shouldn't be an issue at all if you adjusted the hanger @ the trans mount bracket properly.
I know the vid is low quality on sound, I wish I had something with some noise canceling. It sounds like something that is spinning is what's making the noise. Almost a whir/grinding/scraping sound. The exhaust hanger was adjusted, I had the cat removed and the temporary solution on the exhaust is a short glass pack so no contact should be had with that. Checked a little last night and couldn't see anything making contact and I cant quite pinpoint the sound (need to have someone ride with me). I wish it was something that made noise without the Jeep moving but it seems to only be noticeable at highway speeds.
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Unread 01-25-2013, 11:30 AM   #12
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OK, your next bet is to put it up on a lift or on jack stands under the axle. With someone in the driver's seat and you underneath, you should be able to get a good idea of what's making it.
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Unread 01-25-2013, 11:38 AM   #13
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Good call. Thanks!
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Unread 01-25-2013, 03:56 PM   #14
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Is the radiator fan hitting the shroud?...
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Unread 01-25-2013, 04:56 PM   #15
homebrwd
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Originally Posted by Knuckelhead View Post
Is the radiator fan hitting the shroud?...
Nope.
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driveshaft angle , grinding , noise , tummy tuck , ucf skid

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