After removing the differential cover and putting it back on. How will I replace the lubricant? What lubricant should I use and how much? BTW its a 10 bolt.

After removing the differential cover and putting it back on. How will I replace the lubricant? Pass side, in front of the axle tube, is a 3/8 drive pipe plug. Clean the area out to prevent dirt from going inside.What lubricant should I use and how much? BTW its a 10 bolt.It will take two qts, actually, 3.5 pints of SAE 80W90.

If posi-type, add a bottle of GM Limited Slip Additive. Pour all fluids in, then go do figure-8's in a parking lot to lube the clutches.