I would start stripping it apart to inspect every little thing.
I don't know where the tone ring should sit, but for what it's worth, it indicates that the shafts came from an ABS Jeep which means you've got the bigger Ujoints.
shake just rolling down the road? shake when braking?
does anything you can grab underneath move when you shake it? this includes steering, track bar, front shafts, and the tires themselves (after you jack up that corner)
swapped in some junkyard coils in the back and gained a whole inch. big whoop. Now the debate to exchange and try another set of coils.
But I figured now was as good a time as any to switch to my other rims with the not-cut-to-hell tires on them. 265/70s with just a bit of life left in them.