[Shark72]

Changed the rear end fluid and look what I found....
This is after 750 miles, bought brand new! the plug on the left is the drain, the one on the right is the fill.

I refilled using the recommended fluid per the owner's manual, it contains the limited slip(friction modifier) no need to add limited slip fluid.
Now the Camaro SS uses a different fluid (part number) and does require adding limited slip fluid, see owners manual.