Observe the comment by RyanM.
See my mini thread for these tools:
I already had a giant hex key set, but the filler plug bit for a socket wrench was much better. The triple square has a hole in it to match the drain plug.
I use AMSOIL 75W-90. I filled using a small universal transfer hand-pump from an automotive parts retailer that has a few hose nozzle and adaptor gadgets. Though the car was jacked slightly at a nose-up angle, I got a good drain and fill. I could listen to the gurgling noises from the fill hose into the diff', and hear how full it was getting by the audible pitch, then I slowed pumping and watched for the first drip, then sealed closed the fill hole.
You may have to turn the left drive axle by hand to align its cut-out with the fill-hole to fit your wrench.
Earlier in the task, after I drained, I realized I wanted a magnetic drain plug, just for kicks. Also, the stock oil really stinks, it was in fine condition, but just has a stench odor. I fingered inside the drain hole and did not feel any shavings.
I use two small hydraulic 2-ton jacks on each suspension arm shoulder to support, and steel jack stands separate from long 5"x10" (cross section) hardwood deck studs in failsafe locations only jammed hand-snug not as supporting role If a seal were to blow on the hydraulics, the car would not fall or tilt. I rather this much junk under the car to protect me because I live on a quake fault with frequent tremors (ZIP 94583).
Mileage now, 32k.