I have a question. I have seen some posts warning do not go over 50 in 4 wheel drive. My question is if the roads have snow on them and are somewhat slippery. Can you go over on the 50 on the highway? I'm sure I'll get my balls busted for not knowing but I don't want to screw up my 4 wheel drive for when I go offroading.
I agree with MTH. Plus if it's slippery you shouldn't really drive that fast anyway.
But it is possible because I've done it, but that probably wasn't a good idea, because my jeep survived but the work trucks transfercase did not.
According to my owners manual in my Dodge Ram, 2008 Rubicon, 2011 Sahara, you must shift into 4 wheel drive before 55mph. You can go past 55 after that. I do it all the time on the hwy, good for stability.
Your part time 4WD system is much different than most SUVs that have AWD. There is some really good information in your owner's manual that explains when you should and shouldn't use it. You can download a copy at www.jeep.com. Go to the "for owners" section to download it.
"I've got two things in this world, my balls and my word and I don't break them for no one."
Mind that Rubi's chain-based case is different from gear-based case. In any event, you are killing tires. Since there is no inter-axle differential in part-time t-case, a tire must always slip by a small amount due to minute differences in load, pressure, natural wear. It happens even without turning.