Thanks I’ll check the isolators too. One thing I did notice is he installed the rear sway links upside down. Not sure if that’s why it means but certainly affects the way the rear end handles.Might be worth checking that the rubber isolators are all in place. Very easy for an uppers to drop out whilst mauling with the springs.
Also if it’s a Rubicon put it in low 4, disconnect the sway bar via the normal switch, make sure it confirms on the display that it’s disconnected, then reconnect again on level ground.