You will be disassembling a lot of the rear axle housing. You will need to determine your rear end size in order to purchase a differential cover gasket (and the cover if you decide). Most likely you have the 7.625" rear but check to be sure.
• Necessary safety steps: chock wheels, jackstands, etc.
• Remove wheels.
• Remove calipers and hang them up and out of the way (I like to use a bungee cord).
• Remove rotors.
• Remove differential cover, allow gear oil to drain into drain pan. There may be a brake line that is clipped into one or two of the bolts holding the cover on. These can be fun to move around. Clean the magnet off while you're there.
• Remove the pinion shaft bolt.
• Remove pinion shaft.
• Push axles in (one at a time) to access c-clips.
• Using a mechanic's magnet remove the c-clips.
• Carefully slide the axles out of the housing.
• Since you're replacing the axle seals you can use the tip of the axle for leverage to pry the old seals out or you can get creative with a screwdriver/tire iron/etc. being careful not to damage/score any surrounding areas.
• Rent a slide hammer if you don't already have one to remove the bearings. There are instructions in the kit.
• Use brake parts cleaner to clean everything up.
• Install new bearings.
• Install new axle seals.
• Scrape old gasket off differential housing if you haven't already. Brake clean this as well. Needs to be perfect for a good seal.
• Carefully slide axles back in.
• Reinstall c-clips.
• Reinstall pinion shaft.
• Reinstall pinion shaft bolt.
• Two options for differential cover gasket: 1 - Use RTV and bolt differential cover on, wiping away excess RTV (You will have to wait until the RTV cures before you refill with gear oil) or 2 - Buy a new differential cover gasket. If you get a new gasket, put a few tiny dabs of RTV on both sides of it so it will stick to both the housing and the cover.
• Bolt differential cover (with gasket) on, 28 ft/lbs torque.
• On the front of the rear differential, passenger's side there is a fill hole. Use your 1/2" drive extension to fit in that hole and loosen the fill plug.
• Get creative to empty almost 2 quarts of the finest synthetic gear oil you can find (Mobil 1/Royal Purple) in 75w90 weight and reinstall fill plug.
• Reinstall rotors/calipers/wheels.
• Grab a cold one and enjoy peace of mind!
This link (Kyle's) should prove to be more than helpful:
Rear Axle Service