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I had the exact same issue two weeks ago when i rebuolt thefront end. One of the concerted auto hubs had taken water so i removed the hub, and removed the centre gear section of the locking hub. Cleaned it out, regreased it and put it back in. Then i had no 4wd.
I removed the hub and when i put the centre gear part back in i didnt line up the two tabs on the gear to the hub. So it wouldn't lock in.
Not sure if this helps but theres really not much to the auto hubs.