A single 4.70:1 transfer case is the best bang for the buck mod to give you control off road. Depending on where you wheel you can do a lot with a solid rear bumper.  I would go rear bumper first, sliders second, and the. A front bumper when it comes to protection.  If you shorten the bed that is a super functional mod off road.

I had a carb 85 truck on 32s and did a lot with nothing other than a mild lift. 33s crossed the line with stoc 4.10 differential gears on the street, but I was in Colorado so you may have a little more hp to work with.