Very helpful thread! Had my rear locker refuse to unlock after running Fordyce last week. We ended up draining the gear oil, pulling the diff cover, and manually sliding the ring to disengage it. I think the sticking was the result of dirty gear oil (that's another story), but am not sure. I changed the oil, but have not yet attempted to use the locker again for fear of it getting stuck again (I need to be able to drive it on the road and am not excited about having to go through the headache of that process again). This thread gives me the info I need to tear into the innerds of the locker if need be. Thanks for your work and for posting it up for our benefit.