Here is the writeup you are looking for -->
https://www.camaro6.com/forums/showt...highlight=diff
It's for the SS 1LE, but the E-Diff and procedures are the same here.
You will use a little less than 2qts, and no flushing is needed.
Pop the fill plug first (it is above the drain plug), then the drain plug. Let it drain until it stops, then clean those dirty plugs (they are magnetic as you will see below, they pick up a lot of metal). Here is a pic of the drain plug hole while draining and a pic of the nasty metal filled fluid you will find (don't freak, that's normal and only has 1,500 miles on it).
Put the drain plug back in, put the pump in bottle one, and start pumping! Keep going until the second bottle is almost out (it will start to seep out of the fill plug).
Hope that helps a little...