Originally Posted by Carpenterman

You don't have to remove the exhaust, but you probably will have to remove the trans. support (by jacking the trans) to get at the front flex disc bolts. With the center support freed, the driveshaft comes out to the rear. Of course, you'll have to loosen the collar nut and collapse the shaft to free it from the rear flex disc. The support wants to hang up on the parking brake linkage, but you can finagle it out.

I would go ahead and replace the center bearing and bushing if it was me. One of those "while you're in there's" and it isn't very expensive. In my experience, the bushing fails at the fold in the rubber and yours looks OK.

There's a reason the vibration appeared, probably separate from the center support. Check the condition of the transmission mount, the tightness of the output flange, the hitch in the U-joint, whether any balancing weights have come off the shaft, and the condition of the centering bushings at either end.