Would be no issue if you have a fully built rig with uprated diffs, but I've seen people wreck stock 4x4 systems by leaving the center diff locked on pavement. Not fun. Not cheap.
Not great for your tires, either... OR your fuel economy, which is a good as reason as any to leave the system disengaged if you don't need it. And if you're on pavement and have the right tires (good snows or summers), you usually don't need it.
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