This vibration (not a GOOD vibration - Beach Boys) felt "centered" in the car - so I understand Siegs chasing the driveline settings.
The rest of the car felt planted and smooth. It's really a "nice old car". I don't mean that as a slam - rather it's a description of a car that hasn't been Pro Toured in our usual rotisserieed / body off $250K build... I've owned several of these, and this is a nice one.
I've felt driveline angle issues, and when it was the pinion setting - the vibration felt "rear" and sounded "rear". It was also usually MUCH more pronounced than what Sieg is dealing with.
This felt more "harmonic" to me. I think it's the too short (and perhaps unbalanced) driveline "orbiting"... and it may have already ruined the output shaft bearing - or at least - being in the process of doing that. The output shaft is already unsupported for a pretty good distance... then you hang a driveline on it.
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