"friction" diff lock


Has anyone tightened the friction diff lock for rocky? my lock worked well when i bought the car but when i changed the limited slip oils into it all locking capabilities were gone Sad so the previous owner used normal diff oils so the friction parts are ruined (?). so has anyone chimmed the lock and have you got anything good come out of the project. i haven't found any other diff locks to rocky so this might be the only way to improve its offroad capabilities.. thanks