As I reread my original post, I see why no one commented until now.
Let me restate. I need to obtain definition of terms and their values, along with relevant equations, suitable for calculating the side gear separating force as a function of applied torque, for a given gearset.
I am not attempting to design a gearset, but need to understand the separating force for any gearset I might run across (Ford, GM, Chrysler, etc.).