The hub and bearing assembly is nonreplaceable. Should they wear out or break, they need to be replaced as one whole unit. It applies to the front hub and bearing assembly of all models and Armada models respectively (rear hub and bearing assembly). In a 4WD model, if you are removing the front hub and bearing assembly or the rear hub and bearing on an Armada, remove the cotter pin and loosen driveaxle/hub nut. Loosen wheel lug nuts, lift vehicle, secure it on jack stands. Remove wheel. Take off brake disc. Take off wheel speed sensor from the hub. From behind knuckle, unbolt retaining bolts of the hub. This can generally be achieved without removing the drive axle by making use of a swivel socket together with an extension that is long enough. If there is no tool arrangement that will unscrew the bolts with the drive axle in position then it will have to be removed for you to do this task correctly. Expose knuckle, remove disc shield from knuckle (hub) Open end of driveaxle should be disconnected from splines on 4wd model for both front hubs as well as rear hubs in case of Armada (if you're taking out a rear hub bearing assembly on a 4WD model or an Armada). Clean knuckle flange & knuckle bore surfaces where they join onto the mating surfaces of the bearing Insert hub/bearing subassembly into knuckle or onto end of driveaxle for models equipped with four-wheel drive system or rear wheels only in case of Armada models Put multi-purpose grease onto splines of driveaxle on 4wd vehicles Install NEW bolts and tighten them while putting disc shield in place Reinstall wheel speed sensor bolts Mount brake disc, caliper mounting bracket & caliper On the front side install drive axle/hub nut for 4WD & armadas' backside hub/bearing assembly and tighten it in place Place new cotter pin. Mount wheel, lower the vehicle and torque the lug nuts.