Here's the products that I used:
Buy Permatex The Right Stuff Gasket Maker (5 oz) 29208 at Advance Auto Parts
The exact same stuff used by Ford GM Mercedes on their assembly lines.
Buy Mobil1 Synthetic Gear Lubricant LS 75W-140 (1 qt.) 102490/98FS32 at Advance Auto Parts
75W-140 x 2 bottles plus 75W-90 x1 bottle (to save cost since only half is used).
Adding the oil:
Cut a 12" piece of clear PVC tubing 3/8" Inner Diameter and 1/2" Outer Diameter and twist in onto the cap as far as possible.
Do this before you remove the seal from the bottle of Gear Oil.
With the sealed bottle and tubing connected, position yourself under the vehicle and install the tubing into the fill plug opening as a Mock trial. Set it up so you are comfortable and the bottle well positioned above the axle/differential housing and nicely looping into the fill plug.
Now you're ready to begin the filling procedure. Keep the end of the PVC tube bent upwards until it fully resides within the fill plug.
Filling can get real messy if you don't precautions to prevent spillage. The oil is a heavy weight but it flows easily and quickly.
Finding the filler plug (No drain plug exists)
Applying the Gasket material:
It is applied on the inside portion of the bolt holes.
Draining The Fluid:
I left the top bolt loosely in place.
Cleaning the gasket mating surfaces:
You'll note that they must be clean and free of oil before applying the gasket material.
Well, that takes quite awhile because your Diif gearing continues to drip fluid for quite some time. I used a rag stuffed into the bottom of the Diff casing to absorb the dripping oil.
I also used a nylon chisel from Northern Hydraulics to scrape the remnant gasket material off the mating surfaces. I used 3M's adhesive remover aerosol to aid in the process.