Still have low freq vibration (95 A6Q)

[Grant Lenahan]

my first suspicion was tires - feathered or cupped.

Swap them front to rear or put on snows to check fast

Grant
On Sep 22, 2009, at 7:05 AM, <beattyr2003 at cox.net> wrote:

> I posted about this oh about a week ago and only saw a couple  
> responses, neither of which could be the problem.
>
> I have noticed some more things about the symptoms.
>
> Its most noticeable at speeds around 20-40mph.  Its irrelevant to  
> having the car in gear or in neutral, clutch in or out.  I had said  
> before it went away when I turn, thats wrong, it doesnt go away  
> turning it stays the same.
>
> The best way I can think to describe it is if you were driving on a  
> very finely cut rumble strip in the road.  Or grooved pavement.  It  
> also feels/sounds? like its coming from the rear of the car.
>
> Since its not dependant on the engine being engaged, I can rule out  
> anything motor related.
>
> I know what wheel bearings going out usually sound like, they howl  
> at nearly all speeds instead of vanishing at 50+ mph.  So that  
> rules out bearings.
>
> I am left with thinking its either something in the rear  
> drivetrain, or my tires somehow have worn in an odd fashion to  
> cause this odd noise.
>
> Anyone got any ideas on this?
>
> Things I have done with the car recently are replacing the prop  
> shaft rear CV joint over the summer and I just replaced both rear  
> tie rods.  I have verified that the center bearing support has not  
> come loose nor does it look like its in terrible shape.  I could  
> crawl back under the car and verify that my CV joint bolts havn't  
> started loosening up, but other than that or swapping all 4 tires  
> out, I am kind of at a loss for where to go next.
>
> Thanks,
>
> Rob
> 1995 A6Q (271k miles)
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Grant Lenahan
glenahan at vfemail.net
(201) 602-4702 mobile