Removing and installing 2001 aztek awd hub bearing?

I have a 2001 aztek with awd. the rear sensorc for the abs and awd wire is broken with not enoughf slack to put on a propper splice on it so I got a new hub bearing embly with the sensorc. is the only bolt holding it on the main bolt "the big one in the center" or is the three threaded bolt holes on the tringle part behind the wheel studs, help keeping it attached to the car. if so how do i get them off I didnt see any place to get a wrech in there. and any one know what the main bolt size is it a 32mm