Difficulty Level: 3/5 Materials Needed: 2.10 quarts of 75W90 or if your tow 75W140 (Rear) 1.25 quarts of 75W140 (Front) 1 Bottle of friction modifier (if you have a Trac-Lok) 1 Tube of RTV or Paper gasket 1 can of WD40 Grease/Anti-seize Drain Pan 1 can of Brake cleaner Tools Needed: Floor Jacks Jack Stands Ratchet Impact Wrench (optional) 1/2" Socket 15mm Socket Empty 3/8" Ratchet w/no socket 8mm Allen Lower Pump Unit Scraper/Wire Wheel Hammer/Rubber Mallet Flathead screwdriver A case of your favorite beverage (beer) Rear axle: (about 60 minutes) 1) Set parking brake. Jack the rear end up. Place your jack stands in place. 2) Get your drain pan ready. 3) Remove rubber fill plug. 4) With a 1/2" socket, unbolt the diff cover (all 10 bolts) 5) Take your flathead and place it between diff cover and housing and hammer, repeat on the other side. 6) Remove cover and let the oil drain. Clean guts with brake cleaner. 7) Inspected for any damage and wipe metallic shavings. 8) Spray some brake cleaner on the back of the diff cover and wipe. 9) Remove the old RTV lube on the housing and cover. 10) Apply a small bead of red RTV on the diff cover and let it cure for between 1/2-1 hour. An alternative method is to use a paper gasket, or a LubeLocker gasket. 11) Apply some anti-seize on the base of each bolt 12) Begin to tighten the bolts in a star shaped pattern. Torque for the bolts are 30 ft/lbs. 13) Start to fill the diff with oil until oil starts to come out of the fill hole. Replace rubber fill plug. 14) Remove jack stands and floor jacks. Front axle: (about 45 minutes) 1) Set parking brake. Jack the front end up. Place your jack stands in place. 2) Remove skid plate (if applicable). There are four 15mm bolts on each corner. 3) Get your drain pan ready. 4) Take a 3/8" ratchet (without a socket) and remove the fill plug. 5) With your 8mm allen remove the drain plug. Let the diff completely drain out. 6) Replace the drain plug. Do not tighten this too much because this diff is make out of aluminum and will crack. 7) Start to fill the diff with oil with oil until oil starts to come out of the fill hole. 8) Replace the fill plug. 9) Replace the skid plate. Put some anti-seize on the threads of the bolts.