How do you replace a seal axel in a 1989 GMC sierra?

To replace the axle seal in a 1989 GMC Sierra, start by removing the wheel and brake components to access the axle. Next, detach the axle from the differential by unbolting it and gently pulling it out of the housing. Remove the old seal using a seal puller or a flat tool, clean the area, and then install the new seal, ensuring it is seated properly. Reassemble the axle, brake components, and wheel, making sure to torque all bolts to the manufacturer's specifications.