99 expy air conversion/lift question

[JOlsen]

OK I know I'm at risk of beating a dead horse here but I am trying to get some solid info on what to do here. So I picked up this expedition for $400 so didn't really get to choose what I got,kinda had to get it for that price. I wanted 4x4 and lifted but here I am! OK so I want to go maybe 6 inches or so higher. I have noticed that factory expeditions without air sit higher then mine, so here's the meat of my question.
Do I need to convert to factory without air and then do a lift or is there a kit that will help me do both. I have read many posts on this but I have some conflicting info. Please help me out here. I currently am on 33's but would eventually love to be on 37s.
OK expy gods. Help

And go!

 

[ExplorerTom]

How much trimming are you ok with? With suspension lift alone, highly unlikely you'll get 37s without trimming.

Going to need a body lift as well- most likely.

Or the Superlift.

 

[JOlsen]

I am fine with trimming. I just want to know the easiest way to get the truck converted and lifted. And most cost effective