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Good morning. If mine, I would follow the manual for the transfer case service intervals. In my experience, if you are not towing the majority of the time, it wouldn’t fall under the severe duty category
For the differentials, I would follow the same maintenance schedule that you follow for the transfer case. In many applications, it is the same fluid specification for the diffs as the transfer case. Sometimes they are using a different additive (friction modifier)
YMMV
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