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Everything else will stay working as before after the air is cut from the transfer shift lock, only now you will be able to shift the transfer easier and on the move.

Yes, this is true, all the 939 series have the same transfer case with the wreckers having a pto, it is easier just to put the lock on all the transfers, I guess they were worried that the transfer would get bumped out of low at a bad time ??, the wreckers have the lock to keep the transfer from...

Also the anti shifting lock is not needed unless you have a wrecker where the lock keeps the transfer from going in gear while using the back end, just remove the air supply, plug both the air line and the shift lock. this is the same as airing down.