HOW DO I REVOVE THE REAR AXLE ON A 99 F-150 TO CHANGE THE SEAL?

Turn the differential around until you find the small bolt that is holding the differential pinion shaft into the carrier housing, this is the shaft thar runs through the carrier housing that the spider gears rotate on. Remove the bolt and slide the pinion shaft out towards you, if you have limited slip there will be a metal spring shaped kind of like an S that will need to be carefully pried out using a screwdriver or pry bar. You will need to remove the brake drum or rotor depending what type of brake you have on the left side, then just push the axle into the housing about half an inch, look in the center of the carrier housing on the end on the axle you just pushed inward, there will be a C clip on the end of the axle. The C clip looks like a washer with a notch cut in it, remove the C clip using needle nose pliers or a magnet, the axle should now just pull out.

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99 F150