Had a vibration and finally got aroundtuit. Turns out to be bad u-joints at either end and a notchy bearing. Nissan sz cannot replace u-joints so must buy whole new assembly at an insane price. Found a driveline specialty shop, they say "rebuild your DS, 3 new u-joints & ctr brg OR we turn it into a one-piece. Either way $250CDN. Went with the one- piece, smooth as silk YAHOOO! works great!
Cheers