This would not affect a truck with manual hubs already or one with drive plates (be it ADD or not). This would only affect some (mini only AFAIK) trucks that had automatic hubs. Those are the ones that pop lock when you engage 4WD and unlock by backing up. It's a relatively small number of 1986 thru 1995 Hiace vans and Hilux trucks. They didn't use the thrust washer, star washer and locking nuts like regular trucks.
From the side they looked like this: