The removal and installation of the hub in 4WD models require special tools and considerable care so before commencing the task it is best to have a good grasp of the entire process or have it done by a dealer service department or a repair shop. Start by lifting the front of the car and making sure to place it firmly on jackstands. Always remember to keep the caliper hose attached and always keep the caliper suspended by means of a stiff wire in order to prevent strain. In the case of a manual free-wheeling hub, rotate the control handle to the free position, then remove the hub cover and take off the free-wheeling hub assembly by unscrewing the snap-ring and bolts. In auto-free-wheeling hub designs, unscrew the hub cover, open the O-ring, snap-ring and spacer/shim and disassemble the hub assembly. Unscrew the lockwasher and loosen the locknut with a special socket and breaker bar then loosen the hub on the spindle. In order to repack the bearings, you are to pry out the grease seal, remove the inner wheel bearing, clean everything with solvent and check on damages. Apply high-temperature grease to the bearings, grease the spindle and bearing race, and place the inner bearing and new seal. To install, simply slide the hub onto the spindle, fit the outer wheel bearing and pre-load the bearing with a torque wrench. Different model years have specific procedures to follow in terms of locknut adjustments, installing hub assembly, and verifying hub turning force. Lastly, re-attach the brake caliper and wheel, then bring the vehicle down to the ground.