The hub and bearing package comes fully sealed and you must replace the whole unit whenever it's worn out or damaged. This method works on all new hubs at the front of the car, and for Armada models it works on the rear hub. For 4WD models and Armadas, to take out both the front and rear hub assemblies, you must remove the locking pin of the hub and gently turn the nut. First lay the car on jackstands after lifting it with a jack. Remove lug nuts from one wheel at a time and hand-tighten the nut on the transmission output shaft. After lifting or hoisting the car, disconnect the wheel speed sensor and pull off the brake disc from the hub. From the back of the knuckle, you can undo the hub retaining bolts with right tools attached to the driveaxle, saving you the effort of taking off the entire driveaxle. After that, take off the hub and wheel-cover plate from the inner frame of the wheel fork. Also detach the hub assembly from the drive axle splines if needed. To add a hub and bearing assembly, first clean the surfaces on three parts: knuckle, bearing flange, and knuckle bore. Slip the assembly into the knuckle's open end from the front or back, depending on whether you're working on a 4WD or full-size Armada (using multi-purpose grease as needed for the splines). Position the disc shield in place and put on new bolts, making sure they're very well fastened. After that, put in the sensor that checks wheel speed, brake rotor, bracket to hold up the caliper, and caliper. For 4WD cars, put the driveaxle/hub nut on last and tighten it, then add a new cotter pin. Afterward, put the wheel back on, let the vehicle down, and screw in all lug nuts.