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I have a 2000 F350 and have issues with the hubs not disengaging. I checked the vacuum at the hubs and everything looks to be working ok. Passenger side is the one thats not working. can truck be driven without the hubs installed to test the steering?
What is leading you to the hub not disengaging? What are you experiencing in the steering? I can drive my truck in 2wd with the hubs locked with no steering issues.
Have you ever taken those hubs apart and cleaned/greased them? It's not real difficult to do, you just need to be careful to get them together the same way they come apart.