I had a lunchbox almost kill me... you know that slop you were talking about. Mine opened up one day when pulling across an uncontrolled highway crossing, pulled out and there was just enough twist in the axles that it unlocked one side and then twisted just enough to unlock the other side, sounded like a giant ratchet spinning backwards and I was sitting pretty with a semi coming strait at me. I pressed the clutch, let up on the gas, as I heard the ratcheting slow down... clunk and lock in, I hit the gas, dropped the clutch and prayed (you could tell the semi driver was praying too) I fishtailed into the parking lot.... drove home and pulled the diff out and put an open on in that night, through the lockright up fron and ran an open rear.
I will never run an AUTOMATIC locker in the rear of my truck again. Open, Spool, selectable, or if its a light wheeler limited slip, but NEVER another auto locker