I undestand that only about 7 or 8% of 80 series (from 93-97) came with the front and rear lockers. Of course they all have the center diff lock.
Just make sure to look for the locker switch to the left of the steering wheel and to the right of the power mirror controls. Also get down on your knees and make sure the actuators are on the axles. Then put it in 4 low and lock up the axles and verify that they work.