This weekend my Dad tryed to put his 2004 Superduty into 4 wheel drive and it wouldn't go in. He called me and I told him to get out and lock the hubs, he had already tryed that and said one side wouldnt lock. So today I pull the lockout apart to grease, and check everything. Everything looked good on the inside so I put it back togather and its still frozen. Nothing looks broken, but just won't lock. We may just put a set of Warn Lockouts on it and be done. Anyone else had this probem?