IDK how many people know, but all dungeon gear from Lv61+ is convertable.
But you must be within 1 level of the dungeon or something strict like that, as most of my gear wont gain any spirit bond, except the Lv70 stuff, and i think my Lv69 stuff, in a Lv70 dungeon.

I keep 2 sets of gear, to help get rid of some of the old gear, and slowly convert all my older green gear.