i have a 96 ford f-150 and i am going to change the hubs from automatic to manual ! i have the button on the dash that says 4x4 and low range ! i was told that i don,t have to bother the transfer case by changing the automatic hubs to manual hubs ! i was told all i had to do is lock in the hubs and then hit the button for it to go in 4 wheel drive ! is that correct ?