[s-cars] Transmission Vibratons? (long)

[jpb3]

Eric,
I had really bad vibrations at 80mph.  The subframe bushings were the
culprit. They looked ok visually but when I removed them the were
effectively torn in half.   This was @ 110K miles.

I would definitely check those.

HTH, good luck.


John B

On 2/12/07, Eric Renneisen <racingiron at comcast.net> wrote:
>
> I've done that, both with the shafts on and off.  I've been unable to
> isolate the source of the vibrations.  They can be felt strongly from
> inside the car, but from outside I can just see the results (hood will
> shake if it's open, I can feel the vibrations if I touch the front of
> the car, etc).  I have even put my hand lightly on the propshaft, and I
> can feel some light vibes, but it's not dancing around.  Same with the
> halfshafts and front suspension components.  The gearbox itself doesn't
> visibly move around.  I can feel some vibes on it, but it's tough to say
> if they're normal engine vibes or something else.
>
> Thanks,
> Eric R.
> '86 urq
> '93 S4
>
> -----Original Message-----
> From: calvinlc at earthlink.net [mailto:calvinlc at earthlink.net]
> Sent: Sunday, February 11, 2007 9:39 PM
> To: Eric Renneisen; 'chris chambers'; s-car-list at audifans.com
> Subject: RE: [s-cars] Transmission Vibratons? (long)
>
>
> Why don't you have another person run up the speed without the shafts on
> and then feel the tranny/engine directly for the vibrations.  My first
> suspicion would be the driveshaft....40 mph is either classic "U-joint"
> or driveshaft territory on older RWD cars. --Calvin
>
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of Eric Renneisen
> Sent: Sunday, February 11, 2007 7:17 PM
> To: 'chris chambers'; s-car-list at audifans.com
> Subject: Re: [s-cars] Transmission Vibratons? (long)
>
>
> Engine mounts are new.  Transmission mounts were new aftermarket, but I
> found that the mounts that came with the low mileage 6-speed provided
> more support than the crappy Chinese new ones.  Vibes are present with
> either installed.  Subframe mounts are original, but seem to be fine--no
> obvious wackiness there.  Are there any specific checks for the subframe
> mounts?
>
> If any of those mounts were at fault, I should certainly get the vibes
> with none of the shafts installed, right?  My thinking is that the good
> motor and tranny mounts soak up all the vibes, but the shafts provide a
> path for the vibes into the rest of the car.
>
> Thanks,
> Eric R.
> '86 urq
> '93 S4
>
> -----Original Message-----
> From: chris chambers [mailto:fastscirocco_2000 at yahoo.com]
> Sent: Sunday, February 11, 2007 8:31 PM
> To: Eric Renneisen; s-car-list at audifans.com
> Subject: Re: [s-cars] Transmission Vibratons? (long)
>
>
> Eric,
>
> I don't believe you have proven the trans is at fault, if it was the
> trans the vibes would be there all the time.
>
> What you have done is proven that you get vibration whenever the
> propshaft or halfshafts are installed.
>
> What is the condition of your engine/trans/sub-frame mouunts?
>
> Chris
>
>
>
>
>
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