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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) Slight rumble


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Last Post: Dec 31, 2012 6:55 PM Last Post By: KasesAudi
KasesAudi

Posts: 40
Registered: 01/23/07
Slight rumble
Posted: Sep 18, 2012 8:40 PM
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I have a bit of a rumble on take off and on bumpy roads, feels like from the rear of the car. I cant tell if it is center or closer to the wheels. Under load i feel it and at time when just coasting at high speeds over road bumps, i can feel it.

Im not sure if it is drivetrain or suspension related. All shocks are new, there is no play in the rear CV, the bearings are good, rear upper and lower control arms were replaced recently, i did notice a slight tear in the rear trans axle side mount bushing. The rear transaxle mount bushings look ak but im not sure how to test. Car was put on lift and i tried to move the wheels like checking for a bad ball joint. But nothing moved.

What else could be the cause without throwing toms of money at the problem. Is there any way to test check the sub frame bushing besids trying to re torque the mounting bolts?

Ay help would be greatly appreciated.
honest lou

Posts: 202
Registered: 12/11/04
Re: Slight rumble
Posted: Sep 18, 2012 9:57 PM   in response to: KasesAudi in response to: KasesAudi
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I know you say you replaced all the struts, but on the fronts did you replace the strut bearings? The strut bearings are at the top of the strut and they rotate as the wheels are turned. The bearing when worn will give a low level rumble when going over something like a speed bump. The top of the strut is moving back and forth very slightly at the top of the mount.
KasesAudi

Posts: 40
Registered: 01/23/07
Re: Slight rumble
Posted: Sep 19, 2012 7:51 PM   in response to: honest lou in response to: honest lou
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Yes the upper stru mounts were changed. It is definately coming from the rear. Im starting to think maybe a transfere case bushing mount or some other bonded rubber bushing. But i will welcome any other theories.
KasesAudi

Posts: 40
Registered: 01/23/07
Re: Slight rumble
Posted: Dec 31, 2012 6:55 PM   in response to: KasesAudi in response to: KasesAudi
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Turns out it was the propeller shaft bushing. It was toast.

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