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hi guys,

I have a 2012 Cayenne S which has done about 56k miles. When I turn the steering and press the accelerator, the rear left tyre judders. My brother observed that the wheel looks like it was 'locked'. 

My mechanic disconnected the transfer case motor, and after he did that, everything was back to normal (there was a 4x4 error as the transfer case motor was disconnected). According to him, since the transfer case motor is disconnected, the transfer case was not being used and he came to the conclusion that there is a problem with the transfer case. Another gearbox specialist I consulted with said that the problem is due to the transfer case motor. According to him, even though the motor is disconnected, the transfer case is still being used. He also gave me some other reasons which I forgot. I am not sure who to believe.:helpsmilie:


BTW I have  also done the following:-

1)Change the transfer case fluid

2)Change the rear axle fluid

3)Refurbish the rear left driveshaft


The problem became worse after doing the last 2! both the transfer case & axle fluid were dirty but nothing serious.

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just a quick update, the juddering  was caused by the rear differential. Had to get it rebuilt. To confirm if its the rear differential, try disconnecting the motor which engages the rear differential. If the problem goes away, its the rear differential and if it doesn't its probably something else.

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May be this can help you.  My garage have done both diffrential and Tranfercase oil change with gereric equivalent fluid.  After couple week, I had wheel juddering in front left when turning and accelerating, feeling like a locked 4x4 or bad CV joint.  I have read on Audi forum these car are limited slip differential and TC.  I replaced all 3 component with original dealer fluids and everything was back to normal.  My mechanical lost his bet with me.  Original fluid supposed to have a special additive for the limited slip, and this eliminate the 4x4 effect and drive now like a real quattro.  Cheap to try, do you want to bet ?

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Yep, it amazes me how many owners of what are expensive cars will skimp on the fluids they use. If a specific fluid is specified, it's for a reason. Unless you know for sure what that reason is, it's common sense to go with the dealer stuff.


Penny wise and pound foolish can result in horrific cost !

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