You need the ring AND the pinion, because they are a matched set. Then you have to have the bearing preload, pinion depth, etc.. set up or the gears will chew themselves apart.
It is possible to put the LSD carrier in an open case, you just have to grind a little bit of the case out so that the carrier will clear.
And the LSD unit wont swap into the front :-(
And for some reason, even though *I* logged in, and my "brat" logged out, I'm posting as her.. weird.. (This is Andrew/Hondasucks...)