Okay, update time. I spent the weekend and replaced the differential axle seals, both flex discs, center bearing, rear diff mount,transmission mount and both motor mounts! I need to do this on separate weekends! Anyway, its my everyday driver and I can't afford to have it off the road long.
Both flex discs had cracking in them, so I am glad to have it changed. The center bearing rubber had pulled free from the bearing and the driver side motor mount had separated, but not like some of the pictures I've seen here. Either way needed to be changed.
Success? NO! The aforementioned vibration still exist!
Can rear sub-frame mounts on a wagon cause this kind of vibration? I really don't know where to look. The exhaust looks fine and not touching anything and the exhaust to transmission bracket is solid tight.
If I can hear it while its not moving and in Park, Neutral, Drive would you suggest putting a jack on the body + a piece of wood and lift up on the body near the mount to see if the sound changes?
Just scratching my head here. Advice needed.
Oh, and if you want to know how the center bearing removal went......
http://www.peachparts.com/shopforum/diesel-discussion/327628-bearing-explosion.html