I forget what I was looking for on the Rift forums but I stumbled across someones post when I found this. Someone took the time to make a complete list for all of the dungeon/raid drops. They dont have drop rate %s but its the closest thing i can find. If your like me, searching for the nonexistent cloth gear that never drops this may help! (Seems to rain leather and chain ^^)
Wish that someone would make an updated addon for this sort of thing!