How do you go about doing this on my 1991 4x4 nissan hardbody? i know the two wheel drives that you have to take the rotor off and unbolt the bolts from the back that hold the hub to the rotor then replace the studs. but on the 4x4 it looks like the bolts are on the outside and you just undo those and slide the hub off. is this correct? do i have to do anything with the 4x4 manual locking hub?