Before disassembling the bearing(s), purchase or rent the tool required to remove the locknut and adjusting nut from the spindle, and obtain the parts necessary to replace the inner bearing seal, as it should always be replaced when the hub assembly is dismantled. If the special tool is unavailable, the procedure should be handled by a dealership or shop specializing in this work. Early model 44FBJ axles require two pullers for this procedure; if these cannot be obtained, a dealership or repair shop must handle it. Begin by raising the vehicle and securely placing it on jackstands, loosening the axleshaft nut before raising the vehicle for early models. Remove the locking hub assemblies if equipped, followed by the brake caliper assembly. Use a socket and extension to remove the six flange bolts through the flange holes, rotating the hub for access. Remove the outer axle nut and use a puller to detach the hub assembly, then mount it in a vise with soft jaws. Carefully remove the inner cup, bearing, spacer, outer cup, and retainer plate from the hub using a special tool and adapters. For axles not equipped with integrated bearing/hub assemblies, pry out the inner bearing assembly and seal after removing the retainer bolts and retainer from the steering knuckle; for those with integrated assemblies, only the inner seal needs to be pried out. To remove the outer bearing cone, reposition the puller assembly and add the proper adapters, then remove the retainer seal from the hub, ensuring to keep the respective cup and cone bearing sets together. For early model 60 axles and all locking hub models, remove the hub cap and snap-ring on full-time 4-wheel-drive models, then remove the flange bolts and lock washers. Straighten the retaining washer tabs on full-time models, and remove the wheel bearing locknut retainer washer and adjusting nut using a special tool. Pull the hub and disc assembly off the spindle, allowing the outer wheel-bearing cone and roller assembly to slide out. Pry the inner wheel bearing grease seal from the hub and remove the inner bearing cone and bearing cups using a puller and slide hammer. Inspect the bearing cups for pits and cracks, replacing them if necessary, and drive in new cups with care. Clean all old grease from the bearings using solvent and blow them dry with compressed air without spinning them. Inspect the bearing components and replace them if excessive wear is noted, then lubricate the bearings and bearing cups with multi-purpose lubricant. Clean all old grease from the hub. For installation on early model 44FBJ axles, carefully install the new retainer seal using a suitably sized piece of pipe or wood block, then install the retainer flange and outer bearing cone on the hub. Press the bearing onto the hub and follow with the outer bearing cup, spacer, inner bearing cup, and inner bearing cone. Remove the tool and take the hub assembly from the vise, then install a new O-ring on the steering knuckle and slide the hub assembly onto the axleshaft. Align the hub retainer with the steering knuckle flange, install the flange bolts, and tighten them in a criss-cross pattern to the specified torque. Install the axleshaft nut and tighten it to 100 ft-lb, continuing until the cotter key can be inserted. Install the brake caliper and lower the vehicle. For early model 60 axles and all locking hub models, position the inner bearing cone and roller in the inner cup and install the grease seal, then carefully position the hub and disc assembly on the spindle. Install the outer bearing cone and roller along with the adjusting nut, adjust the wheel bearing, and for vehicles with model 60 axles, install the drive flange with a new hub gasket, followed by the lock washers and flange bolts, tightening them to the specified torque. For full-time 4-wheel-drive models, install the hub cap and snap-ring, then install the brake caliper and lower the vehicle.