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Unread 09-24-2013, 06:47 PM   #1
Sal
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Join Date: Jun 2003
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Wj Help me with this noise please

1999 wj v8 When traveling 40 mph and faster when I let off the gas and coast there is a constant howling or whining noise. The slightest touch of the gas and it goes away until the jeep decels. I am having a very hard time figuring out where it is coming from. It sound like a bearing but could be wrong. Here is the strange thing about it. Put the jeep up on stands and brought it up to speed. The noise is not there while coasting on jack stands. I can eliminate the transfer case and front axle since they were changed. The jeep has rezzepa joints in the front and u-joints in the rear. I am guessing it could be either drive shaft, possibly rear wheel bearings or the rear axle pinion bearings. Would any of these cause my noise? There is also some vibration associated which is felt from the passenger seat and passenger rear. One more thing I have done is sit in the cargo area and put my ear right above the rear differential and the noise is barely heard. Is there a drive line specialty shop anywhere in NY or NJ who can find my problem. I have no problem doing the work myself but very frustrated because I cant find the problem. If anyone has any idea let me know. Need to get this repaired. Thank you.

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Unread 09-25-2013, 05:00 AM   #2
asatxj
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Sounds like rear wheel bearings. Are you rear axle seals leaking?
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Unread 09-25-2013, 06:21 AM   #3
Sal
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No they are not leaking. I did not think wheel bearings noise would come and go with the accelerator?
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Unread 09-25-2013, 06:26 AM   #4
Lustra
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Sounds like rear wheel bearings, I can hear them too LOL

Quote:
Originally Posted by asatxj View Post
Sounds like rear wheel bearings. Are you rear axle seals leaking?
_______________________________________
Quote:
Originally Posted by newfieZJ
We may have gotten off to a bad start , but , you are one ignorant SOB
Yes , the mileage is stored in the PCM , it's only available through a DRB scan, it is irrelevant to 99% of jeepers
What about the other 1%?

________________________________

Silly Hillbilly
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Unread 09-25-2013, 01:53 PM   #5
Sal
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Another thing noticed, if I am coasting and put the jeep in neutral the noise is still there but not on the jack stands. What makes you think wheel bearings over the pinion?
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Unread 09-25-2013, 02:11 PM   #6
asatxj
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Great job kids!
Ok how about a rephrase;
Based on the symptoms you present it is a possibility that you may have a bad wheel bearing. It could also be a pinion bearing as it has a load on it when you are accelerating and when coasting no load and could therefore produce noise. Producing an accurate diagnosis without actually hearing it is excedingly difficult.
I would go through the drive line and eliminate things, ujoints, xcase output shaft bearings etc. Check for wear and replace what's worn.
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Unread 09-25-2013, 02:26 PM   #7
nolimitssjca
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Sal for what it's worth I was chasing a noise with similar characteristics. Only grinds under braking or deceleration. Turned out it was the cable to the transfer case dropped down near the axle and was rubbing. Found the clip that hold it to the transmission failed. Put it back up and the grinding is gone. Good luck!
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Unread 09-25-2013, 08:33 PM   #8
Lustra
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Sounds like special ed to me Kids!!!


_______________________________________
Quote:
Originally Posted by newfieZJ
We may have gotten off to a bad start , but , you are one ignorant SOB
Yes , the mileage is stored in the PCM , it's only available through a DRB scan, it is irrelevant to 99% of jeepers
What about the other 1%?

________________________________

Silly Hillbilly
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Unread 09-26-2013, 05:44 PM   #9
asatxj
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Quote:
Originally Posted by Lustra View Post
Sounds like special ed to me Kids!!!
Hey watch it lad, I'm actually a Special Ed. Teacher!
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Unread 09-26-2013, 06:04 PM   #10
JTS97Z28
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If I had to guess I say something inside the differential. You would think wheel bearings would make noise regardless of load on the rear gears. Load changes in those gears and so does your noise, so I'm a bit surprised to see everyone pointing at wheel bearings.
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Unread 09-26-2013, 07:22 PM   #11
MattJeep
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I have the same noise, except mine starts from any speed. Its more prominent when I'm off the gas. I removed the front driveshaft with little change. I think its the pinion bearing unfortunately. Dont know if I wanna fix it or buy a non Varilock 30, put an Aussie in and swap in a 242.
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Unread 09-26-2013, 07:34 PM   #12
StormChaserTim
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Matt, your V8 should be equipped with the D44. Mine is.

See if this applies to you.....
http://wjjeeps.com/tsb/tsb_wj_030300.pdf

Tim
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Unread 09-26-2013, 07:41 PM   #13
MattJeep
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Thank you Tim, I think that would only apply to 99-2000? Mines a 2003. I'm pretty positive its coming from the front. But again, thanks for the possible free fix.
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Unread 09-26-2013, 08:15 PM   #14
StormChaserTim
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Oh, whoops....!

I was telling you one thing, and responding to the OP too, lol.

Tim
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2000 Grand Cherokee Limited 2wd, 4.7L V8 - It's blazing fast, blue, and the heap of Jeep.
2002 Dodge Ram Quad Cab 2wd, 4.7L V8 - Hailstoned, windshield cracked, storm chasin' truck. But dependable.
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Unread 09-27-2013, 03:02 PM   #15
Lustra
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Then you know what I am talking about.

Quote:
Originally Posted by asatxj View Post
Hey watch it lad, I'm actually a Special Ed. Teacher!
_______________________________________
Quote:
Originally Posted by newfieZJ
We may have gotten off to a bad start , but , you are one ignorant SOB
Yes , the mileage is stored in the PCM , it's only available through a DRB scan, it is irrelevant to 99% of jeepers
What about the other 1%?

________________________________

Silly Hillbilly
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