[V8] Center Driveshaft bearing and clunking

[Mark Kalbskopf]

Ingo,
I did a cursory inspection of the rear diff mounts and they looked to  
be OK, but it's not easy to see.
I only checked whether they appeared solid.
It's just started pouring with rain outside, otherwise I'd go out and  
take another look!

mark

On Sep 5, 2011, at 2:07 PM, Ingo Rautenberg wrote:

> Mark,
>
> I can't answer your question, but will add that a contributor to  
> driveshaft slop can be bad rear  differential mount(s) also.
>
> Something you may want to check at the same time.
>
> -Ingo
>
> On Sep 5, 2011 2:01 PM, "Mark Kalbskopf" <gbmarc at cox.net> wrote:
> > This is only generically V8 related but . . .
> > Does anyone have experience of how much play is acceptable in a  
> center
> > drive shaft support bearing?
> > I'm talking about pushing the driveshaft up and down so the rubber
> > compresses in the bracket.
> > My daughter's A4 Quattro (manual) has a clunk or thump going on on
> > every time you let off or go back on the acceleration.
> > I crawled underneath and expected to see the rubber surrounding the
> > drive bearing all shot but it wasn't. Now, the rubber had some small
> > cracks in it when flexed but it was all solid.
> > The shaft had about 3/4 to 1 inch of flex between me pulling it down
> > and pushing it up.
> > The U-joint had no play, neither did the CV joints and I couldn't  
> see
> > any obvious problem with the transmission mounts.
> > Is 3/4" too much flex? How solid is a new one?
> >
> > Mark
> >
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