How do you replace ball joints on a 1988 Chevy Blazer 4WD?

To replace the ball joints on a 1988 Chevy Blazer 4WD, first, safely lift the vehicle and remove the front wheels. Disconnect the brake caliper and rotor, then remove the lower control arm and any necessary components to access the ball joint. Using a ball joint press, remove the old ball joint and install the new one, ensuring it's properly seated. Reassemble the components in reverse order, and don't forget to check the alignment after completing the job.