I already have them in both buggies. Just trying to figure out how they work.
Sounds like they do not work like a torsen as many have said. The torsen gives power to the wheel with most grip.

Thank you for explaining even if I still don't understand how the squares can lock the diff.

edit:
Hmmm, I think I got it. They don't actually lock up but since the gear is in the hole the viscosity of the oil makes it 'lock-up'. The normal diff has more space between the gear and housing not allowing the oil to lock it.


edit again:
Even I have a hard time to understand what I wrote. Ebonics here I come .....