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I realize this an older thread but wanted to post my experience which is like a couple other members reported 2 qts drained 3 added, i have a new to me 2015 non electronic rear diff with 22,880 miles on it,
While it didn't seem to be very really dark fluid but wasn't clear enough to have been a recent change, also the silver color while stirring it the drain pan and the typical ferrous metal on the magnets. I used the Valvoline 75/90 full syn flex fill pouch, overall an easy job and my OCD is cured for the time being.
I got my 2014 2 years ago. I changed all the fluids just to be sure someone else didn't screw it up. Just don't put the magic super duper monkey juice in it. Go with GM fluids.