I have a 2008 Rubicon Unlimited, would like to know if possible to bypass computer to engage locking diffs in 4 wheel high.

 

There are a few threads on this.

It involves grounding the locker relays; violet wires.

The new wire will go from the locker relay ground wire, to a switch in the cab, to the nearest ground point.

Some of the programmers will allow 4hi locking, too. No modification necessary.