All 100 series have the center diff and high and low range. The newer ones went to a traction control system instead of a rear locker.
This is great info on the 80 series, now I know why our 91 80 has no front and rear lockers. Learn something new everyday!
-Matt
The 98-99 100 series cruisers did have the option (or maybe standard?) for a rear locker. The switch is on the left, like the switch in the 80 series. The 2003 models do not have the option, it is not available. I do not know when they took out the option for a rear locker. Just makes me sad...