that's what some of the 1970s-80s style GM hubs needed....not this design.
get in--buckle up--hang on
"soothing agricultural implement/personal servant/Walter Mitty multidimensional access utility device conveniently travels on pavement when necessary and often keeps me warm/cool/dry/soothed as needed."
JK hun\bs are always locked. Even the old manual hubs on CJ's did not require backing up, you simply turned the handle on each one. Where I think the confusion is coming from is that backing up is a way to fix binding caused by driving in 4WD on pavement. I can also help get you into 4L if you are having an issue lining up the gears.
"I've got two things in this world, my balls and my word and I don't break them for no one."
Ford also required (past tense) this procedure for a while. I had a '91 Explorer and '95 Bronco that required backing up about 20', per the owner's manual. My 2005 Explorer did not require backing up to release.
It just depends on the type of 4x4 system in the vehicle.
Wrong Way Hal
1972 C-101 / 1984 CJ-7 / 2012 JKR