Yeah, I was looking at those "Lock Right" things, and they look kind of similar to the Detroit Lockers, but something about them doesn't look quite as strong.
But I'm not really sure I want a true locker. The Eaton DL looks tough, but it looks like it'd be noisy and rough.
The TrueTrac is interesting. Looking at its gears makes my head hurt though. If I had to guess, I'd say that it has something to do with the way a worm gear (or in this case, helical) turns (but can't be turned by) the other gear.
What about Positraction? I was kinda throwing around the term "Posi" earlier, but Positraction is actually a particular type of LSD, isn't it? ...the spring & clutch type? Or is it just a marketing term that GM slaps onto any LSD/"LGD"?