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Old 06-07-2014, 07:26 AM
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Rotational noise driving me nuts, diagnosis help needed

Hi, all. Need some help trying to diagnose a rubbing noise that's driving me crazy.

2010 WK, 3.7, with a 2-inch RC level, 1-inch wheels spacers, stock wheels and 32-inch tires. Rig has 60k miles on it when I bought it stock a couple months back. Put a couple hundred miles on it before lifting and maybe 1k miles since the lift. I have a work car, so the WK is only driven on weekends. The noise started about two weeks ago.

The noise itself is definitely rotational, as it increases/decreases with wheel speed. It's a rubbing, almost rubber sound, with some very slight clunking. My best guess is left front, but I know sometimes it's hard to tell from the cab. It may be slightly worse with a very tiny bind when turning.

What I've done: Checked for obvious tire rub and any loose suspension components. Nothing. There are no idiot lights on. Jacked both front wheels up and didn't get any telltale signs of bad balljoints or TREs. Both wheels spin smoothly, but I can somewhat re-create the noise when spinning the wheels off the ground. It's the rubber boots on the CV axles rubbing against the spindle when the wheel is at full droop; this shouldn't happen at ride height, though.

Otherwise, all CV boots are intact and don't appear to leak; they also have no slop. No slop in driveline. I sprayed the CV boots with WD40 just to see if the noise was the rubber rubbing against itself. No change.

I feel like there must be something obvious I'm missing. Any help is appreciated. Thanks.
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Old 06-10-2014, 08:39 AM
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Re: Rotational noise driving me nuts, diagnosis help needed

No help?
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Old 06-11-2014, 05:39 AM
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Re: Rotational noise driving me nuts, diagnosis help needed

It could be the tread on one of the tires let go. Try rotating your tires to eliminate that theory...
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Old 06-11-2014, 05:48 AM
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Re: Rotational noise driving me nuts, diagnosis help needed

worse case is a wheel bearing is on its way out
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Old 06-11-2014, 08:52 AM
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Re: Rotational noise driving me nuts, diagnosis help needed

Very interesting. Tires have less than 1k miles on them, but I'll rotate them to see.

Never replaced wheel bearings on a vehicle without a straight front axle. I assume the bearings are part of the CV assembly?
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Old 06-11-2014, 06:15 PM
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Re: Rotational noise driving me nuts, diagnosis help needed

The bearings are part of the wheel hub.

Usually, warn bearings will change noise as they are loaded. When going through curves, does the noise change? If so, the wheel bearings are a likely culprit.
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Old 06-11-2014, 06:46 PM
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Re: Rotational noise driving me nuts, diagnosis help needed

The risk of lifting is that it increases the angle of the drive shafts particularly the front. Check that they aren't rubbing.
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