Well I have yet another hub question. I have manual locking warn hubs on my car right now, but they are not working right took them off and tested them, and they are not good. So I am going to get a new set. My question is, should i get another pair of the manual ones or spring the few extra dollars and get those auto locking hubs. Another question How do those auto locking hubs work, and do they need the vacuum system??