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Yes I remember you made that clear much earlier.Dave for me it’s never been a requirement to go from high to low or low to high on the move. In the numerous 4wds I’ve had that’s never been required and always been done static (or almost).
The previous argument has been the capacity to engage the centre diff lock (in high range) whilst driving. Every 4wd I’ve had has this capacity (Toyota up to around 100km/hr), whether via a stick or push button, and not to have that capability would be a major flaw.
I could be wrong on part/all of the following as I am not a diff expert
I believe this is possible on a Torsen style centre diff as used in lots of vehicles and in our popular dual cab utes that are 2WD on road and locked 4WD off road. They don't usually have 4WD unlocked so need to be able to be locked on the move.
I was surprised to learn that while it is possible to lock and unlock the centre diff in a Defender old series at any speed LR certainly don't recommend doing it unless you are pointing all wheels straight ahead and none of them are slipping.
I sure wouldn't be prepared to take that chance particularly when they state it will cause damage, not may cause damage.