Detroit locker posi unit??

First off, let's get you straight on the terminology. A Detroit locker is not a posi. A posi is a limited slip unit either clutch or cone type and "posi" is a General Motors term. "Sure grip" is Mopar's term for the limited slip unit. A Detroit locker is not a limited slip unit. It has no clutches or cones. It is a locker, just as the name implies. What it does is lock the axles together and make the rear a spool and unlocks the axles around a turn.....UNLESS you go around a turn under enough power to keep the axles engaged. Yes, they typically have more slop than say a clutch or cone type sure grip. That's just the design. They also make noise when engaging and disengaging. Perfectly normal. There are Detroit "Soft Lockers" that make less noise but they still make noise and function the same. They are very stout and reliable, but can be somewhat dangerous in snow and ice. The wheels can slip enough going around a turn and cause the unit to stay engaged and cause the car to "push" through the turn. That ain't too good. As long as you drive them carefully with that in mind, you probably won't have a problem.

Oh, and as for the most dependable unit.......I'd say you have it hands down.