You cannot lift the front of an IFS vehicle 2" without compromising downtravel and thus handling and ride. To do it properly you must replace the control arms but at the risk of eating CV joints as it places them at more of an acute angle.
The best way to gain more clearance from a Navara is to install a solid front end and coil over rear - but that is expensive. $20k plus to have a shop do it and engineered.
Next best is to body lift and add larger rubber but once again you put strain on the drivetrain components.