I understand the bypass switches... but are you guys saying that the rear locker is not suppose to work at all in 4hi? That doesn't make sense.
It's a safety legal deal. Since 4hi is used on some street conditions it really becomes a safety issue when diffs are locked. Jeep doesn't want to be sued by some idiot that buys a Rubicon and has no clue how to operate it. Esp with the explosion of the 4dr market and all the new Jeepers that brought in.
There are ways to rewire and install bypass switches as the others mentioned to activate lockers or Superchips flashpaq will allow you to override the lockers in 4hi, but only one f/r can be locked in 4hi. I believe the Superchips will still be overridden once a certain speed is attained and the diff will be unlocked. Not sure about Hypertech if such feature exist. But there are options.
08 Silver Rubicon
3" springs, shoxs, fuca's, adj f tracbar, SS brake lines, drag link flip and brace, steering stabilizer, 9.5Ti, frt bumper