Just to hijack slightly... Tubby said that the "lockers" being sold are "just a spool". Ummm when a locker is locked, isn't that the point you are after? Locked carrier == spool
I don't know where I said that the "wannabe locker" being sold is a spool Pat. Spool is 100% locked at all times. A true locker can un-lock.
I've run full spools,mini-spools,Detroit Lockers, 1st and 2nd Gen. ARb's, various lunchboxes and even a Lenco Locker. Pay to get the real thing if you want the traction. Get an open carrier and Lincoln/Hobart /Redneck if need be.
Some people have had success with the Trac-Loc trick mentioned in past posts. I'll stick to the real thing thank you.