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Old 03-12-2011, 07:11 PM
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Vibration When Turning

I recently bought my son a 1999 Grand Cherokee. I have shot all the typical problems with dash speakers, door lock motor, heater blend doors, and an O2 sensor. I really like the car over all as does my son. But I cannot figure out the last problem that needs resolved. When making a sharp turn, like a U turn or in a culdasac, it has a very bad vibration. I assume it's in the front end because it only occurs when turning sharp. I inspected the UV boots and they look good. I am thinking about changing the transfer case fluid. The car has 79K miles on it. Anyone out there experience anything similar and/or have some advice???
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Old 03-12-2011, 07:52 PM
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Re: Vibration When Turning

milage is low for CV joint failure...sounds like maybe front diff may be locking, maybe someone forgot to put gear oil additive in diff. When turning slowly at full lock steering, (U turn) will the front end sort of wobble?
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Old 03-12-2011, 08:09 PM
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Re: Vibration When Turning

4 things it could be. Brakes, Alignment, Tires, or Tire Balance.
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Old 03-12-2011, 08:20 PM
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Re: Vibration When Turning

Yeh, what Bob said, could be the limited slip additive (or at least lack of it)in the front diff. Is the car Quadra-Drive? If yes, there is a Vari-Loc in the diff, which will lock the diff in case of difference in left and right wheel speed (wheel slip).
The additive should allow for some slip, which should be enough when making turns. Lack of this additive will in fact lock the diff completely and will not allow difference in wheel speeds left/right. One of the wheels will (or has to) slip, and that can cause vibration.
Ofcourse the vibration could be caused by front axle CV joints as well.
If you didnīt do it yet, it would be a good time to start with changing the diff fluids (T-case you already mentioned) and depending of the maintenance history you have (or not), also the tranny fluid with filters, engine cooling liquid and brake fluid.
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Old 03-13-2011, 05:40 AM
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Re: Vibration When Turning

dude,transfer case fluid,change it. genuine oil recommended. should fix it.
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Old 03-13-2011, 01:55 PM
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Re: Vibration When Turning

I thinks you guys nailed it. I am an old corvette guy, not much 4 wheel experience. There is a wobble when you turn tight. When I had my son drive in a tight circle with me standing in the middle, the back inside wheel would spin a little periodically. Is it safe to assume the same additive goes in the rear differential? Is the additive something I can get at the local Napa Auto Parts or is it a dealer item?? Thanks for the help.

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Old 03-13-2011, 07:38 PM
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Re: Vibration When Turning

When you have the Vari-Loc in the fron t diff, then for sure your car has Quadra-Drive and then also the same Vari-Loc in the rear diff. Not sure where the best you can buy the Limited Slip Additive, but one of other guys will chime in for sure.
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Old 03-13-2011, 08:59 PM
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Re: Vibration When Turning

I think the dealer, if it cost a buck more, so what you've got the right stuff,and the right size 1 bottle =1 diff
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That's the WRONG side of this fence Bub, and these ain't Halos.. Daddy don't like nobodyz in here with his jeeps!!! Let's play chase yer balls, you gotz any balls, do ya?

07 WK LTD 5.7, with 13000 klm (7600 miles)So Far... repaint and debage, probly shoulda just got the SRT in the begining...now Im gonna hafta go expensive exotic aftermarket to be Blissfully Demented. SRT Nose and Stillens shiney new shoes SRT springs, Front/Rear Sways, WK HD Bilsteins, a couple of plastic bits from JforJ, all ready to go on. SRT Headers and mid pipes with cats waiting for the new predator inTune ( it'll match my new iPhone...Wait maybe its a iPhone app ) SRT coil covers & roof rails another problem to be solved
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