runners with the Elocker will have a "RR diff lock" button on the left side of the dash, at the bottom of the gauge cluster trim on the left side of the steering wheel. not all 96-00 runners had it
Rear locker locks the rear axle so that both wheels get power at the same time, open diffs are what cars drive normally because only 1 wheel gets power, to understand this better please watch this: start at 1:50