That is a diagram for the Eaton G80 locking diff offered by GM. It is not a "LSD" in the conventional sense. It has a governor weight that flys out when differential wheel speeds exceed a certain level, which drives the clutch packs together and locks the diff solid.
https://www.youtube.com/watch?v=tTGZOJQQBeE
They work great in my Trailblazer, it has them front and back.