Here is how you can loot level80 blue rings.
1: Go into the new single player instance in thunder river (Slaughterhouse)
2: Go all the way through the instance to where you have to click the post to spawn the alligator boss
3: After killing the boss relog out to the password screen and log back in and re click the post to spawn the alligator boss, just keep doing this again and again till you get your drops
Note: I found that the blue item chest drop was poor on one of my toons but on another toon I got 5 rings in 5mins