A selectable locker for the rear is preferable so you can control it better. I have an Auburn ECTED and it's great.
I'm going to do a lunchbox style auto-locker probably in my front D44 eventually. It's open for now.
SupersonicFX4 (Adrian) whom I haven't seen on here yet since I've been back swears by the locker in the front of his truck rather than the rear and it's an automatic "lunchbox" (like the PowerTrax type). He says it's great for the rock crawling he does. He had no rear locker last time I talked to him but he did have the rear Torsen LS which helps also.
John Griggs -- Kennett Square, PA
2002 Ranger 4x4, SAS'd, with too many other mods...