Whine in the rear - JeepForum.com

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post #1 of 42 Old 10-30-2015, 06:51 AM Thread Starter
Tobeornottobe
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Whine in the rear

Hi all I just bought 05 Grand Cherokee. It had a high pitch whine in the rear on accelerations, stop when you let off. Did some reading and had all the bearing changed in rear. They said hubs were ok pinion ok , the drive shaft has a very very slight rough spot in one unjoint. So still have the noise .... What else is back there to cause this? I don't want to throw parts at it!!!!

Thanks

Pinion looks ok right ???

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post #2 of 42 Old 10-30-2015, 06:57 AM Thread Starter
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Pinion
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post #3 of 42 Old 10-30-2015, 07:07 AM
Nejeep
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A whine from the rear end that changes with acc/decel is usually due to the ring and pinon gear being out of alignment. If the bearings in the differential were among those recently changed, the ring and pinion alignment should have been reset to factory specs, which is not a simple or easy job. Was that done?

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post #4 of 42 Old 10-30-2015, 08:07 PM
Tango.
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If the back lash was set wrong on the rear diff you would have metal there burnt from the gears.
The pinion can whine for a very very very long time before going out.

Could be the transfer case bearing also, so determine the location rear-end vs. transfer case..

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post #5 of 42 Old 10-31-2015, 08:05 AM
fishinbama
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At least down here, there are very few places that can expertly tackle a differential setup and nail it dead on(none even). If you suspect ring and pinion, I'd get another axle. It really doesn't take long to swap one out. The junkyards will have it delivered to your door, if your street is accessible to trucks. Sounds like the shop you patronized wanted that markup on those parts they threw at it.

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post #6 of 42 Old 10-31-2015, 09:04 AM Thread Starter
Tobeornottobe
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The person that did bearing last time put them on crooked so they wore out was metal in the rear dif case . All the bearings were replaced and I assume that it was set to factory specs. I'll call them and see if done . Do you have to pull it all apart to set ring up ?? Thanks
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post #7 of 42 Old 10-31-2015, 10:01 PM
Tango.
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When you said ALL bearings were replaced does that mean ALL bearings? There are wheel bearings which are sealed units by the wheels, and there are the differential bearings that hold the differential, and when those are replaced you need to reset the back lash and re-shim the bearings to get it right, or it will whine. The pinion bearing can also make is whine like that. That is if it is the rear end. If it's the transfer case there are bearings there too.

The picture does not show the gear teeth, which you can look and see if there is wear on them, and it doesn't show the magnet, was metal on the magnet? These are things to check to determine the issue. Did you measure the fluid that came out was it burnt and was it the right amount? That is a few other things to check.

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post #8 of 42 Old 11-01-2015, 12:51 PM Thread Starter
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As far I I understate all the bearing except the wheel hub/ bearing were replaced , I will have to call them and verify the gear teeth did not look worn , there was filings in bottom of case when he took cover off. Oil was not burnt but It was full to the plug . I will check the settings that he did . Thanks so much for ideas!
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post #9 of 42 Old 11-06-2015, 09:54 PM Thread Starter
Tobeornottobe
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Ok busy week , but will check asap, I tested noise it is still there if I shift to neutral, also if I shut it off. Now if it is a bearing would it not get hot ? I ordered the serviceable drive shaft , but I don't really believe that's the cause of whine . Can A person not get jeep up on jacks and run it to try and narrow down the noise location ?
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post #10 of 42 Old 11-06-2015, 10:27 PM
cparker72
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At first look i read WINE in the rear. I guess that's just wishful thinking
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post #11 of 42 Old 11-07-2015, 06:54 AM Thread Starter
Tobeornottobe
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Lol I was going to put something about cheese in there ......
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post #12 of 42 Old 11-07-2015, 07:01 AM
Tango.
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yes you can lift it on a lift or stands, remove the wheels and check for the whine, remember it's 4x4 so remove all 4 wheels. did you check the back lash?

Life is hard-John Wayne
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post #13 of 42 Old 11-08-2015, 06:14 AM Thread Starter
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Ok I thought so... I'll have to get the shop guys to check it they did bearings sooooo!
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post #14 of 42 Old 11-17-2015, 07:19 PM Thread Starter
Tobeornottobe
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Well I called to book appointment to have new drive shaft put in , I told him I didn't think it was the cause and said I figure it's the ring and pinion settings , he assured me it was set properly, he said he will put it on hoist and run it ., see if we can hear the noise!!! Crossing fingers .
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post #15 of 42 Old 11-17-2015, 07:40 PM
darot
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had exactly the same issue, had bearings replaced with no change in noise, maybe a bit better not really noticeable change. The shop screwed up my drive shaft and I'll be installing my second used one this week in an attempt to make the vibration go away. I have been told the ring and pinion needs replaced to fix the noise.
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