grinding noise - : Jeep Wrangler JK Forum
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post #1 of 8 Old 09-15-2014, 09:12 PM Thread Starter
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grinding noise

i just got a 2008 jeep jk and resently it started making a grinding noise from the rear but only at about 20 to 35 mph , anyone know what the issue may be?
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post #2 of 8 Old 09-15-2014, 10:04 PM
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"Grinding" is kinda subject to interpretation and maybe mine's the wrong one, but maybe bearings?

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post #3 of 8 Old 09-17-2014, 12:54 AM
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Usually with bearings I get a clicking noise, I've had that with both wheel bearings and ujoints. I always replace them before it gets worse. As for a grinding noise, could be wheel bearings I guess if they are that far gone. Could also be your ring and pinion gears. Might even be something in your transmission. Or a bad brake pad that is touching the rotor.

Need to try and figure out where the sound is coming from honestly or start poking around to see if you find something that looks wrong. lots of moving parts that could make a noise if they are not maintained or somehow got damaged. Regardless, if you're not mechanically inclined (not saying you're not) then you might as well take to a shop and let them figure it yourself a lot of hassle in repairing the wrong thing.
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post #4 of 8 Old 09-17-2014, 09:05 AM
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does the noise "change" when you apply the brake?

does it increase with RPM? Does it change with engine speed or road speed?

Have you changed your gear lube recently in the differential?

any other changes/repairs you have done or had done recently?

metallic grinding or rubbing on plastic sound?

have someone walk beside the vehicle while you slowly drive to try and narrow down it's location.
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post #5 of 8 Old 09-17-2014, 11:54 AM
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I would pull the diff cover off and check to see if there is and flakes or chucks of metal, I had a rear in go out in another jeep of mine that made a "grinding" noise and then few days later going down the freeway, blew the rear end. The sound was from the pinion bearing.

But deff would pull the diff off. Or shop like stated above!

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post #6 of 8 Old 09-18-2014, 09:53 PM Thread Starter
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thank you to all ... i have set my jeep up on stands and have inspected the rear brakes didnt find much just a few metal shavings but couldnt pin point the noise ... next i will be checking the diff ... on a different topic what would be a good tunner for my jk i need better mpg
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post #7 of 8 Old 09-18-2014, 11:13 PM
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i know when i find shavings or flakes, i get paranoid and anal trying to find where they came from. like they said, pull the diff..

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post #8 of 8 Old 09-19-2014, 12:53 AM
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Did you pull the rotor off to inspect the parking brake? The parking brake in the JK's kinda sucks.

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