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  #1  
Old 06-10-2015, 08:25 PM
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Humming/Grinding noise

Hello all! I'm hoping you all will be able to help me out with this.

I have a 2004 Jeep Grand Cherokee Special Edition 4.0L that I recently lifted with a 2.5" Rusty's Offroad Basic Kit (Coil springs, shocks and I also got a steering stabilizer). Ever since I lifted it I've had this noise which sounds like it's coming from the front end. It sounds like a humming noise sometimes grinding only while decelerating. From 60 to 40 mph it's pretty noticeable, below 40 mph it's not that noticeable. Not noticeable at all below 30 or 25. It seems like it's more noticeable when going downhill, not as noticeable while decelerating on a flat road.

I am hoping it's just because I haven't gotten an alignment done yet but just wanted to see what you all thought. I haven't driven it that much since I know I need an alignment and don't want to cause any premature wear on my tires. So after the alignment if the noise is still around I'll be able to explain a little more and try to pinpoint it more. Any input would be greatly appreciated! Thank you!

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Old 06-16-2015, 05:25 PM
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Re: Humming/Grinding noise

UPDATE: I got the alignment done. Now there's no noise what's so ever from 0-40 mph. At about 45 mph while accelerating there's a humming noise which will last until I let off the gas a little bit then it will go away. If I don't let off the gas it will continue to hum until 60-65 which is my normal highway speed than the humming gets lower (most likely has to do with the rpm). When I decelerate there is a hum from 60 to 40 mph and then it goes away. What could this be? It sounds like it's coming from the front end. Could it be a bad u-joint? I have the Cardon- Rezeppa front drive shaft. It's not an obnoxious hum, but it's a noticeable one. I just want to try to figure out what it is before anything worse happens. I will probably pull out the front drive shaft one of these days to see if that is the culprit. Any help will be greatly appreciated. The alignment shop didn't notice anything when I asked them to check it out...
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Old 06-16-2015, 07:13 PM
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Re: Humming/Grinding noise

If this noise started after the lift, i would indeed suspect one of the two front propeller shaft joints. Just to be sure i would check the front diff and T case fluid levels, Even though this shouldnt change due to the lift.
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Old 06-17-2015, 02:03 AM
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Re: Humming/Grinding noise

Where are the plugs on the differential and transfer case? And what should the level be at for both? I read for the transfer case you should be able to dip your finger in and feel the fluid right below the plug hole, is that the same case for the differential? Thank you for the help so far!
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Old 06-17-2015, 07:11 AM
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Re: Humming/Grinding noise

The right level is when it just starts to overflow from the fill opening, for both the diff and the T-case.
On the differential you will see only one plug on the front cover. A 3/8 ratchet will fit in the plug. The T-case has two plugs on the rear housing, a lower plug (drain) and an upper plug (fill). Donīt remember the exact size, but they are of the allan type.
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Old 06-18-2015, 05:10 PM
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Re: Humming/Grinding noise

I checked the differential fluid and transfer case fluid today. They checked out good. Removed the front drive shaft and took it for a short right. No humming noise whatsoever. So now it's either the u-joint or the Rezeppa joint. Is there anything I could do? Or I guess I'll just have to deal with it until it gets worse or worst case scenario something breaks
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Old 06-18-2015, 06:34 PM
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Re: Humming/Grinding noise

Do you feel any play on one of the two joints? If it produces a grinding noise, i would suspect considerable play on the faulty joint. There is not much to do about it i think, if it is the CV joint, you could try some fresh grease in it, but if it has play, it will most probably not change that much.
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Old 06-19-2015, 10:35 AM
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Re: Humming/Grinding noise

The only play is that I can turn the drive shaft a quarter of the way while parked. The rear drive shaft I can't do that. How would I check the u-joints for play?
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Old 06-19-2015, 01:07 PM
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Re: Humming/Grinding noise

With the prop shaft on the bench, just hold the shaft with one hand and try to rotate the joint. But there cant be that much play on the joints. Check the diff input and T case output couplings for play. Best is to put the T case in 4Lo. A stretched chain inside the T case will be shown by a large movement of the output coupling. A too far stretched chain can skip the teeth and make grinding noises. The chain can be changed separately.
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