Sounds like the hub internals are screwed. Unless something goes wrong it should keep the shaft locked to the wheel hub all the time. There should be no engaging or disengaging at all with those hubs.
As for not being able to move in High Lock, it sounds like the t-case is not engaging into the lock position. When in normal high or low all the power will be trasnferred to the wheel with least resistance if traction is lost. May just need to do a little adjusting on the shifter.
As for not being able to move in High Lock, it sounds like the t-case is not engaging into the lock position. When in normal high or low all the power will be trasnferred to the wheel with least resistance if traction is lost. May just need to do a little adjusting on the shifter.