Yep, I was wrong. Seems it's merely a "brute force" approach where the clutches, cones break loose from enough pressure. This "bias" is determined by the springs.
Found this on one of my favorite sites:
Howstuffworks "Clutch-type Limited Slip Differential"
Thanks for all the input everyone.
Patrick I can answer your question, they use outboard brakes (wilwood). There are pictures on Kirkham's site of some of the components in the "manual" section and also look at Manufacturing, suspention for the outboard components.
Guess I'll be calling them Monday to get my order in, can't pass on a sale. Thanks Joe.