read the sticky 2" lift thread, fugoonesssakes can do it yourself for about 100$ larger tires have many drawbacks. choose carefully after you are informed on the subject. almost anything larger than 235-75-15 will require moving, removing, or cutting body panels. larger tires are like lowering ...
If you're going to install one yourself, it doesn't strike me as 'too' much more work to make your own fiberglass mold and make the topper yourself. Good Luck!
Welcome~! It's funny how you get bit by the Astro bug! I would add this caution. I've seen it posted to get the frictions for TCs from the oem, as usingt auto trans frictions won't deliver satisfacctory performance. Keep us updated!