I wondered about that myself, but I tried with hubs in free and in lock, and no clicking. honestly it didn't make sense after i thought about it that the locking hub would make the clicking noise, but nevertheless, it is gone. Wohoo!
I guess it could have been some sort of clicking in the brake caliper hardware. The rotors were in very good shape, and the caliper hardware seemed ok, but since the hardware is pretty cheap and i already had it torn down, i replaced the pads, pad clips, and the pin & bushing/boot. The only thing about that, is that the clicking seemed to stop when i pressed in the clutch.?? I guess it will just remain a mystery, unless it comes back again. As it is, everything seems to be working fine, so I'm gonna cross my finger, and keep my hands off...Well, at least until i get time to install the suspension lift i just bought