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Unread 11-27-2007, 01:39 PM   #1
Buck2
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Rear differential failed again

One year ago the bearings in my rear differential failed. Replaced under warranty at 60M miles. Now, a year and 20M miles later, same problem....whine coming from rear differential. Dealership won't stand behind repair because beyond their 12 month, 12M mile repair warranty. 82M miles on it now. Also a problem with worn yoke in steering mechanism. This Liberty has only been used to commute to work, no offroading. Is this normal?

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Unread 11-27-2007, 05:30 PM   #2
CATCRD
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I'd say 12 million miles is pretty good to get out of a differential. j/k no it's not normal. Do they have a hypothesis? Manufactured parts and assemblies have variation from part to part. There may be something dimensionally wrong with your housing that just makes it eat bearings - loading them wrong, etc. Dunno, just thinking out loud here. Any evidence of water contamination?
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Unread 11-28-2007, 05:40 PM   #3
shimmy59
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12M is often used for 12,000 not 12 million.
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Unread 11-28-2007, 07:03 PM   #4
JL Rockies
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I would think 12K is more common for 12,000
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Unread 11-28-2007, 07:51 PM   #5
CATCRD
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Quote:
Originally Posted by shimmy59
12M is often used for 12,000 not 12 million.
Hence the "j/k" = just kidding
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Unread 11-29-2007, 05:41 AM   #6
Trombino
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Quote:
Originally Posted by Buck2
One year ago the bearings in my rear differential failed. Replaced under warranty at 60M miles. Now, a year and 20M miles later, same problem....whine coming from rear differential. Dealership won't stand behind repair because beyond their 12 month, 12M mile repair warranty. 82M miles on it now. Also a problem with worn yoke in steering mechanism. This Liberty has only been used to commute to work, no offroading. Is this normal?
Have you spoken with the service manager at the dealership? If not, I would try and get with him/her to discuss the issue. While the work they performed may not be under warranty, the fact of the matter is something is causing you to prematurely wear bearings (that is what they are going to need to figure out and address). While they may have replaced the worn bearings a year ago, they obviously didn't fix the underlying cause. If they won't honor the work they performed, I would consider going to another dealership and tell them the whole situation. They may be willing to help you out to pull your business over to them.

On another note, its nice to see of the (4) replies to this thread, only (1) actually contained some information that may be useful to the OP. However, now I can sleep better at night knowing that 12M and 12k are synonymous.
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Unread 11-29-2007, 07:54 AM   #7
naturist
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Surely this is not normal.

that said, I wonder: do you ever run in full-time 4-wheel drive?

If so, it must be noted that it is absolutely crucial that all 4 tires be absolutely identical in rolling diameter, lest the rear differential suffer damage.

So, my question is, do you run AWD? If so, do you rotate your tires religiously? If the first answer is yes, and the second no, maybe, just maybe, that is the cause of the problem. It's a long shot, I know, but I hadda ask.
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Unread 11-29-2007, 02:21 PM   #8
jeepjeepster
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Could of been a bad axle the first time around and a crappy repair job the second time around.

Find a 8.25 axle in a junk yard from a liberty with the same gearing and call it a day.
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Unread 11-30-2007, 03:23 AM   #9
daxiet
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While the 4WD/AWD question may be a point to consider depending on the model, the Liberty doesn't have a center differential allowing front and rear wheels to spin at different speeds. Thus you should not use 4WD on solid surfaces, should only be used in slippery conditions such as sand, wet/very wet, mud, etc. This is mentioned in the manual. As such driving in a straight line is fine on a solid surface (provided you tyre rotation is spot on), but just don't turn.

Is the current noise and all symptoms identical to those of the first failure?

Does the noise occur when driving straight or just when turning/cornering?

Is there any leaking from the diff?
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Unread 11-30-2007, 12:43 PM   #10
festerw
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Quote:
Originally Posted by daxiet
While the 4WD/AWD question may be a point to consider depending on the model, the Liberty doesn't have a center differential allowing front and rear wheels to spin at different speeds.
If it has the Selec-Trac it does and is perfectly fine to drive on bare pavement in Full-Time 4wd.

I'm betting there was an issue with the bearing replacement and the dealer just doesn't want to admit it.
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Unread 11-30-2007, 02:28 PM   #11
Buck2
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Thanks for all the input, regarding the issue and otherwise.

In my business, M is used to represent thousands for quantities other than $ which would be K. While my issue does ultimately end up to be a $K issue, it started with a M issue. Popular opinion seems to be K for miles so I'm happy with that. Doesn't solve my problem though.

Back to the real issue......since the dealership that performed the first differential rebuild says I'm outside of their warranty period of 12K miles, I saw no point in bringing back to them, and yes, it was making exactly the same gear whine noise this time as it did before the repair.

My local mechanic looked at it, said it definitely is a rear differential problem and referred me to a specialist better qualified than he to open it up. The specialist found worn bearings (same ones replaced by dealership) and worn gears (pinion?), replaced all. Just got it back. He said would be hard to prove but he believes dealership botched the job, put too much torque on when putting it back together, thus premature wear. He stands behind the work and guarantees the problem won't happen again. The mechanic at the dealership apparently was not as well qualified.

I was about to buy a new vehicle from subject dealership which I will discuss with the owner (largest Jeep dealership in the area) and why I now am not. That's about the only satisfaction I will get. Yeah, I think it was going to be the most expensive Grand Cherokee on the lot.

Thanks again for all the input. This case is closed.
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Unread 11-30-2007, 08:28 PM   #12
jeepjeepster
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Quote:
Originally Posted by daxiet
While the 4WD/AWD question may be a point to consider depending on the model, the Liberty doesn't have a center differential allowing front and rear wheels to spin at different speeds.
Select-trac does have a center diff...

Glad you got everything figured out Buck2.

Haha, yea, you did want the most expensive Jeep on the lot!!!
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Unread 11-30-2007, 09:49 PM   #13
daxiet
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Quote:
Originally Posted by jeepjeepster
Select-trac does have a center diff...
As I said some models do not have a center diff, not all (I am one of the "lucky" few who doesn't). Based on the fact that we had little information on the year model, etc. I mentioned the lack of a center diff, just incase it applied.

Glad the issue is sorted out, but frustrating to hear yet again that DC are unable in general to maintain their own creations. Thought such issues were limited to us in SA.
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Unread 12-11-2007, 07:27 AM   #14
JoBo
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BUCK2,

Sounds like you have 2 good mechanics One that knows when a job is over his ability and sends you to a second who is specialist and resolved your problem

DAXIET
A few of us have the NV242 Select track and we are the luckey ones We have Full time and Part time. You may be thinking of the NV249 "all wheel" transfer case
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