I've seen a lot of money wasted on lockers that don't seem to want to lock, and locked rigs that fail a hill that some wheel spin makes it up.  Lockers are just one puzzle piece, suspension is another.  Answering an engine-idle question with a tow-points answer isn't useful.
He asked about a lift kit detail.  Here's my input, get a coil conversion for the rear with those longer control arms.  More flex.