Well if you want to rockcrawl, the best place to start is a locker and a good powertrain. You would be surprised by how far offroad you can actually get on a stock suspension. Get a set of 4.10s or 4.56 gears and a good locker like a Detroit TruTrac or a Powertrax Lockrite. That should be good. As for power, get a good cam and some rockers on that baby and it should put down enough power to get you through some mean stuff, but if you wanna do hardcore stuff, you'll need a bigger engine.