I did the 2inch body lift on my nav.
There was a couple of minor things, but overall it was quite easy to do.
Your front bar/bullbar wont fit, modification will be required (easy enough if your handy with a welder)
your steering shaft will be to short. firstly i made a spacer where the rubber mount is and it fitted, but only just and i was unhappy with it.
I got a spare and chopped it in-half. found some thick metal rod the same ID and the OD of the shaft, took it to a professional welder and had the shaft extended and the tube filled in - strong as shit and the perfect size.
some sort of drive shaft loop that wont fit anymore. just remove it, its not needed. I guess it will stop the tail shaft flopping around if your center bearing failed
Brake lines have more than enough play to make the extra distance.
Fuel lines may work, i had to extend mine by replacing the hose with a longer piece.
Same for the breather line (these lines follow the chassis under driver side up into the engine bay)
the accelerator cable on mine just...just reaches - something to be mindful of when your lifting.
the speed-o cable has heaps of play.
If your still using the stock intake pipe, you may need to extend it, as your body is going higher than the engine...mine was fine as i only had the engine filter connected at the time - not the pre-filter on the body.
your rad pipes will flex enough to take the move, your shroud might need the bottom part removed...if you decide to lower the rad 2inch be mind-full that the fan will fit but you wont be able to bleed the heater core as it will be higher than the top point of the radiator.
just keep those things in mind and it should be sweet.
christian