I'll be honest, I'm still new to 4X4s, so I just want to make sure I don't blow up my transfer case.
Two schools of thought I'm being told are -
If the rear wheels will spin, put in in 4-High.
and the polar opposite -
Never use 4X4 on the road, it's to get your out of the ditch you just slid into.
Roads today are super slick - a blip of the throttle will send the rear swinging out and everyone is spinning at stop signs.