Old thread but I will add some real world experience. I ran 38's on factory 3.73 gears but when wheeling I felt it needed a regear especially in reverse. I went with 4.56 gears and it seemed geared too low. Next tire change I went with BFG 39 KO's and it is just right. 2,000 rpm at 75 mph and...
I've been using the Wix fuel and oil filters with good results. I add them to my Amsoil order, they carry them.
I also run the Amsoil Signature Series 5w40. I was really impressed with how clean the inside of my oil pan was when I dropped it to inspect pick up screen.
My wife, dogs and I did this one last year and it was the best to date.
https://www.jeepgladiatorforum.com/forum/threads/from-nw-louisiana-to-moab-and-back-with-sights-and-9-badges-along-the-way.95723/