did a day trip in and out between high and low range several times throughout the day, got to one particular spot and needed low 4 areal steep down hill decent and thankfully when he tried for low the shifter seemed to be locked in high position, unlocked free wheelin hubs in front and had nothing so had to relock hubs so as it would move, we figure by this that the centre diff lock was locked on somehow reversed several times in case it was lockup but this did nothing, thats about it.