^^^True story there, spring over is not cheap.
Here is a short list you are looking at.
-Lengthened drive shafts
-extended brake lines
-high steer, even on gravel trails they are a hand full. The cheap way would be 4" drop pitman arm, but a word of caution-this will multiply the stress put on the steering gear mounts. After one year of running a drop pitman arm the leverage had worn out the splines on the steering gear.
-rear traction bar to reduce axle roll.
My advice, save your money and wait for a used lift to pop up on craigslist. I love the spring over/shackle reversal on mine but it was way more money in the long run to do it right, and I used springs I already had and built all my own bracketry. A spring under is not without issues but is deff the more cost effective route.