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Old 09-04-2013, 08:04 AM   #1
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High pitched vibration/hum

My 2013 JKU has just acquired a high pitched hum. It's much like tire noise/whine but only kicks in at 45 mph and stops at about 55 mph. I have a 2.5" RK flex lift with 315/70/17 MTR'S on level 8 trackers. It sounds like it is coming from the rear end but I can feel it in the steering wheel. I checked and torqued the bolts everywhere. Any ideas on where I can start trouble shooting this?

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Old 09-04-2013, 08:30 AM   #2
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Quote:
Originally Posted by Martinm66 View Post
My 2013 JKU has just acquired a high pitched hum. It's much like tire noise/whine but only kicks in at 45 mph and stops at about 55 mph. I have a 2.5" RK flex lift with 315/70/17 MTR'S on level 8 trackers. It sounds like it is coming from the rear end but I can feel it in the steering wheel. I checked and torqued the bolts everywhere. Any ideas on where I can start trouble shooting this?
Sounds like the tires?? MTR hum Oops nevermind just read whole post

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Old 09-04-2013, 08:50 AM   #3
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Please check your CV joints. Sounds like maybe a drive shaft issue. you don't want to be driving like that if the case.
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Old 09-04-2013, 09:48 AM   #4
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Thanks for the info. I forgot to mention three things that I doubt change anything but one I have regeared to 4.88's and it is most pronounced when maintaining speed. Accelerating to gain speed it goes away and coasting to lose speed it goes away. Finally it's an automatic. Sorry I was on my first cup of coffee this morning when I posted that.
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Old 09-04-2013, 09:50 AM   #5
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Also what should I be looking for at the CV joint? Basically what is the best way to diagnose a bad CV joint visually.
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Old 09-04-2013, 10:13 AM   #6
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Who did your gears ?
The boots on the end of your DS's. front on TC side and both on the rear. Look for grease splatter.
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Old 09-04-2013, 10:27 AM   #7
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A local jeep shop (Adrenaline Offroad) did the gears. They are very reputable and if that's a problem I'm sure they will help out.

I've had the gears and the lift for two months. This is new.
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Old 09-04-2013, 01:31 PM   #8
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This is the rear by the diff. It's the only place there is anything.
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Old 09-04-2013, 01:42 PM   #9
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It could simply be harmonics also.
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Old 09-04-2013, 02:04 PM   #10
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Yeah I thought about that too but want to make sure.
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Old 09-04-2013, 09:20 PM   #11
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So I crawled under there and spent some time. Front looks fine the rear is what you see in the above pics. I'm guessing some new Tom Woods are in my immediate future. Anyone else have anything to say? I can't find anything else. Stuck my finger in the differential, fluid is fine. Checked the oil and all fluids because I can't think of anything else to check and they are fine as well.
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Old 09-04-2013, 09:32 PM   #12
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I know a guy that chased a funny sound on his JK for a month that ended up being the heat shield for the muffler. If it is not the drive shaft good luck figuring out what it is before it drives you crazy.

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