Just picked CV up 20 min ago, THE VIBRATION IS 100% GONE. Dealer did the exhaust work, I drove at 55, 56, 57, 58, 59 and 60, light throttle, off throttle accelerating and decelerating and I could not induce a micron of vibration, it was billiard smooth and rock solid. It is amazing how annoying this vibe was, it seems to have taken on a life of it's own. I can't tell you how nice it is to have my car back to running as new.
Thanks to all who were persistent in figuring this out and posting the solution. Many of us never accepted "MDS" as the source of this vibe though I suspected the tranny (not water) or gears. Early on , I would never have gussed the exhaust.
The water in the tranny shudder is entirely unrelated to this vibe.
Parts that were replaced: 4581869AG Resonater
Two 4578363AA Nut