Here is the process I use to move into 4lo:
In drive, I let off the brake and begin moving forward.
I then shift the transmission into neutral.
While in neutral, and moving at a slow walking speed, I shift the t-case into 4lo.
Place the trans back in drive.
*Project Yeti* 99 JGC Limited 4.7 w/6.5" Rockkrawler LA & IRO A-arm, Goodyear MTR 35's on MB TKO's, 4.56 Yukon's, Iceland Offroad Bumper/Flares/Sliders, Protofab Rear Carrier, SuperChips, Uniden/Firestick, Flowmaster, Smittybilt 8k Synthetic Line Winch.
My Jeep is Organic - Undercoated in 100% all natural Utah Dirt --- Utah Jeep Crew #49 ~Will
2012 JeepForum GCOTY --- [URL=http://www.jeepforum.com/forum/f197/project-yeti-abominable-wj-1125665/]Project Yeti Build Thread[/URL]