This needs to be a sticky.
This is the guy that tought me how to build the Eaton Posi back in the '80s. This should be helpfull to many people.
This also works on the 8.5 Traction Lock, 9 inch, 8.8 and 7.5 Ford Trac Lock and sevral other differentials that use flat clutches. I go ahead and install the preload springs. Tom doesn't use preload springs. This is a choice that you will have to make on your own.