Got new tires on and still had a vibration in the car. Already have FMS aluminum driveshaft, but decided to check the transmission and crossmember mounts in case the driveline angle had changed.
Everything "looked" ok, but a new transmission mount was about 1/2" taller and the old crossmember bushings were so stretched out they just fell out of the crossmember. The new Prothane bushings raised another 1/2" or so.
What a difference! There is zero vibration in the seat or floor boards now. After a rebalance of the front tires, the car is finally wonderfully smooth!
If you have a vibration in the seat or that you can see in the dash, check those mounts!
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