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CV joints seem to be in good shape. I have not taken them off, but there isn't any sort of unacceptable play in them.
Transmission mounts appear to be OK, no movement when things are pryed on.
I suspect the car has the rubber center clutch, but don't know for sure. Past experiance with them is you can feel slop in the drive train when they start to go. This car when in gear and parked doesn't seem to have any excessive play like that.
I have had several 944's and never experianced anything like this before with any of them.
It's been the same even though we have had a few different sets of wheels, tires on it. So it's NOT a wheel balance issue or slime in the tires.
We've had the car for about 2 years now and it was like this when we got it. It has NOT gotten any worse, but it is an annoyance simply because I can't find the source!
When we bought it I figured it was simply wheel balance. So the old tires on phone dials came off and another set of tires on Fuchs went on. Still the same. Those tires were of unknown age, and the Fuchs really weren't the right size, so in short time another set of Fuchs were obtained, new tires were installed, everything was computer spin balanced and the vibration remains.
I have also installed another set of wheels and tires from a 911 and it is still there.
So with all those different sets of wheels and tires I'm fairly confident I can rule out wheel/tire balance.
Rear wheel bearings are good. No play.
Rear shocks are maybe a little squishy for a track car, but are still doing their job for a street car.
I just don't know where else to look.
I'm starting to suspect a torque tube issue.
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