Update: I installed the new bearings and mazworx bellhousing. Vibration still present.
However the vibration doesn't seem to be a "problem". I said fuck it, drove it all summer, hit a few drift events, and the transmission hasn't had any issues. Shifts nicely. Just sounds like the car is coming apart at 4000RPM plus.
I'll be buying a new OEM Z33 trans over the winter and installing that. If that doesn't fix it I guess I'll just live with it.
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