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hum/buzz when letting off the gas?

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Old Dec 29, 2014 | 09:09 AM
  #1  
aroundincircles's Avatar
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Default hum/buzz when letting off the gas?

I don't know how to describe the noise, but when I let off the gas at higher speeds, I get a hum, or a slight buzz. Any idea what this is/could be?
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Old Dec 29, 2014 | 09:13 AM
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Year: 1990
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Originally Posted by aroundincircles
I don't know how to describe the noise, but when I let off the gas at higher speeds, I get a hum, or a slight buzz. Any idea what this is/could be?
Little more info would help...year/lift/tire/sye?
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Old Dec 29, 2014 | 09:55 AM
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Most of that is in my signature...

89 cherokee
31x9.5r15
3.5" metal cloak

no SYE.

It does not happen below say 55mph, so only at freeway speeds.

I can extend it by letting off the gas a bit slower, if that makes sense.
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Old Dec 29, 2014 | 10:23 AM
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On mobile so I can't see your Sig

Anyways, it sounds like one of your rear joints is failing, probably the one closest to the rear end. Just give em a look for play or loose bolts, when you lift it without an sye the drive line angles play havoc on universal joints, I've had it happen several times... But, at the same time if it's only a noise but you can't exactly feel the vibes, could be a hub, front u joint, or even just tire noise
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Old Dec 29, 2014 | 10:51 AM
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Pinion movement in the rear diff?

Max
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Old Dec 29, 2014 | 12:19 PM
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Replace rear U-joint first.
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Old Dec 29, 2014 | 02:30 PM
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I know I have a front u joint that is bad (drivers side) I'm going to replace those first.
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