If your axles still have the stock gears in them, look at the diff cover and see if there is a small metal tag on the bolts. If there is it will have your gear ratio on it.
You said that this vehicle is for hunting/recreation use and not a daily driver.
What type of terrain will you be hunting and recreating in?
Big rocks, deep sand, mud or just dirt roads?
This is a big factor in deciding if you need to lower your gears. (I had 3.07 stock)
I was running 4.56 with my 33's. That was perfect for rockcrawling in California and Arizona. It was also my daily driver. For sand and mud you might want something higher like 4.11. If you are going to change the gears you might as well install a locker. (You may need to replace a carrier anyway to get taller gears in that D30)
The height of your lift is to provide clearance for your tires.
The size of your tires provides ground clearance under your vehicle. In my opinion you want to keep the center of gravity as low as possible, but just high enough to clear what ever obsticals are in your path. So we are back to where are you going to use it. The tire size between 31, 32 & 33 is also determined by a few things: Provide clearance under your axle, (Main reason) looks, (Mall crawler) and price. The bigger the tire, the bigger the dent in the wallet. (MT's are soft and wear out fast)
Bottom line:
1. The ground clearance you need to get over the terrain you plan on traversing should determine your tire size.
2. The height you need to clear your tires at full droop should determine your lift size.
3. Tire size and terrain will determine your needed gear ratio.
