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.