Chevy changed the spec for the rear diff as pointed out here:
http://www.camaro6.com/forums/showthread.php?t=454487
Instead of calling for fluid only (88862624) it now calls for a different fluid (88900401) and limited slip additive.
However when I go to my.chevroloet.com and bring up the manual they have linked to my car, it still shows the first printing which calls for just the fluid.
Is the new printing applicable to all 2016 SS' or are there different specs for different build lots? I've had the groan when cold (still do) and am due to change the diff oil after taking it to track night. Should we be using the original spec or go with the spec in printing 2 of the manual?