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So before we go any further we need to drain the axle housing. If your axle isnt connected to the truck the best way to drain it would be to take out the fill plug and tip it forward so it can drain out. (The drain plug is easily taken off with a 3/4" 12pt. socket) If your axle is still connected to the truck then you will have to remove all 10 bolts (hence they call it a 10 bolt) that tightly secure the differential cover. (The bolts are easily removed with a 1/2 socket) Be sure to have a drip pan underneath ready to go because as soon as you loosen that diff cover its gonna pour out and make a mess.