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  #1  
Old 10-31-2014, 10:05 PM
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2000 Grand cherokee chatter while turning

My first time at this site.
I have a 2000 Grand Cherokee LTD. quadra drive 4.7 engine.
While turning sharp left feels like wheels are not in synchronization as get wheel chattering. This happened approx. 10,000 miles ago and repair shop replaced transfer case with remanufactured one. It still made similar issue but not as severe was told to drive it and see if got better, which it did to a degree. recently it started up again and is worse. The repair shop owner retired, another shop sent in for transfer case replacement under warranty. Put that one in and now says issue seems a little worse on sharp turns than the one they replaced, like in a parking lot with wheel turned as far as it can go there is wheel chatter like tires not spinning the proper speed, or out of sync. Any thoughts?? thanks. Jim

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  #2  
Old 11-01-2014, 07:05 AM
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Re: 2000 Grand cherokee chatter while turning

This looks more as a lack of limited slip additive in the differential. When not changed recently, i would change the diff fluids and add the limited slip additive, or buy the fluid with the additive already mixed in.
Regarding the T-case, did they use the special Mopar fluid? (which in fact is Mobil 424 fluid). ATF+4 should not be used in this T-case, because it caused clutch chatter in the early years, and was then changed to the "special" mopar stuff.
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Old 11-01-2014, 10:02 AM
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Re: 2000 Grand cherokee chatter while turning

I went over with the mechanic to use the special lube for that tc. I also had the differential fluids changed out at the dealer about a year ago, so I would assume that they used the proper stuff since they are a Jeep dealer, especially since this issue occurred before the fluid change and after.
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Old 11-01-2014, 01:45 PM
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Re: 2000 Grand cherokee chatter while turning

The limited slip additive will deplete over time, eventhough in a year would be strange. But you would not be the first one who let his jeep service at an authorised stealer, and they forgot the (right amount of) limited slip additive. You can rule out the T-case as being the problem by removing the front proppeler shaft (if it has the CV joints, then its 6 bolts upfront and 6 bolts at the t-case)
If it then still binds, then you be sure that the problem is a locking varilok in the front diff. The principle of working is that it will lock both front wheels together in case of a speed difference between the two. During a turn this is ofcourse not desirable, and for that reason the limited slip additive is needed. It permits, as the name already suggests, a limited amount of slip in the varilok, enough to be able to make tight turns, without the two wheels completely locked together and be able to rotate with slightly different speeds.
In this case you will need to add some more additive, but just enough to attain the required slip. You will need to add a bit, make tight figure eights and see if the binding is gone. If not, add a bit more and test again.
An important thing to remember with quadra tracII or quadra drive, is that the tires should wear evenly. If you donīt rotate the tires front to back at regular intervals, you will get a wear difference, which will cause a speed difference between front and rear proppeler shafts, which will cause the progressive coupler inside the T-case to wear out prematurely. Same thing applies for wear differences between the two tires on the same axle, eventhough this normally will not wear that uneven. A wear difference here will cause the varilok to wear prematurely.
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Old 11-01-2014, 02:05 PM
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Re: 2000 Grand cherokee chatter while turning

If I changed the diff. lube myself. would you know how much of the limited slip additive would be needed in both front and rear diff.? thanks for all your help and responses, greatly appreciated!! jim
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Old 11-01-2014, 03:06 PM
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Re: 2000 Grand cherokee chatter while turning

I went to a local auto store to get some of the limited slip additive as I am going to try your suggestion to add some, little at a time, but the only one they had said not for Jeep Quadradrive. Is there a specific brand, or is this a dealer only additive? thanks. Jim
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Old 11-01-2014, 04:00 PM
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Re: 2000 Grand cherokee chatter while turning

Not sure about this. The front and rear diff each need a total of 2.5 oz of limited slip additive (also known as friction modifier) Since the quantity is low, its maybe easier to get this at the stealer.
I would add maybe 1 oz. and testdrive. Make tight figures 8, so that the additive is mixed well inside the vari-lok and can do its job. If after several figures 8 nothing has changed, add another 1 oz. and testdrive. I heared from others that sometimes 2.5 oz. is not enough, but i would also not overdo it.
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Old 11-03-2014, 10:06 AM
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Smile Re: 2000 Grand cherokee chatter while turning

Well, I did as you said, and problem gone!!
You were correct! Thank you so very much, and as well it was an easy fix.
Evidently you know what you are talking about, and I wanted to let you know it fixed the issue and thank you so very much!! Jim
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Old 11-03-2014, 10:40 AM
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Re: 2000 Grand cherokee chatter while turning

That is good to hear. How much additive did you had to add to stop the binding?
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Old 11-03-2014, 11:28 AM
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Re: 2000 Grand cherokee chatter while turning

The tube had a squeeze tube on the end, and I just squeezed in about 1/2 the bottle in the front and 1/2 bottle in the rear differential. That comes out to 2 ounces for each. Drove about 1/2 mile to open lot, sharp turns and The chatter stopped immediately. Big difference.
I would not be surprised if the dealer charged me to change the fluid and never did a thing, as this chatter was on going for a long time, just recently getting worse. Thanks again. Greatly appreciated! Jim
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