I like these Jeep videos on YouTube. They are simple/informative.A quick refresher and an introduction to the new owners on how to use your Rubicon 4wheel drive and lockers.
Enjoy
I would take it in to have it looked at, shifting to 4H should almost never grind.I was driving in the dirt for the first time, I shifted from 2h to 4h around 10 mph and it made like a grind noise, is that normal? It was also a little hard to move the shift lever when I did that. I couldn't get to 4L.