Doctor Diff's 8 3/4" Helical Gear Sure-Grip ("Sure-Trac") LSD

It's a sticker placed on the box about the Ford additive. I ordered it in Sept. of 2018, so it's probably the latest info on that sure grip, and he calls it sure trac. I tried to get a photo of the box, but nothing is working right today. I guess the global warming here at 31* is the problem.