Congrats on the new Jeep. You have a part time t-case so 4x4 should not be used on dry pavement or you runa high risk of breaking something in your t-case. In snow I usually use 2wd until it gets pretty bad and then use 4x4 hi. That way you can shift back to 2wd when you hit some dry pavement. Use 4lo only when it's really bad and you don't want to go more than 20 mph. You also have to slow down to less than 5mph to shift into or out of low range. Enjoy the snow!
Current Project: The Clockwork Orange. 1975 CJ5. Chevy 307, T90, Dana 18.