I've never specifically seen the 3rd gen SA's, but the 4th gen shocks have a horizontal window near the shock hat. There is a little dial in there that you move clockwise or countercloskwise (as viewed from the top) to adjust your rebound. Typically using an allan wrench, moving a hole from the far side of the window to the other far side is called a 'sweep'.
I've never actually counted the sweeps, but I seem to recall reading that there's about 12 sweeps of adjustment. It does take a lot of force to turn them (at least if they're new) and you'll know when you've reached the end of adjustment as they'll become pretty stubborn to move