1. Flesh out your profile. "Stock" for everything doesn't say much.
2. 33's + 3.07 gearing = no acceleration and bad gas mileage, in general.
3. The 9.25 is a strong unit, but parts are more expensive, you're limited to 4.56's (don't quote me on that, actually) and I think It's a C-clip axle, which is not cool. But yeah, you can swap anything...just not sure why you would, in this case. And you to regear the front as well, you know.
4. Yes, you need more than just the kit...basically, you need all the common modifications to lift a TJ 4"...a quick search will turn up the particulars.
If it's worth doing, then it's worth [I]over[/I]doing.
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The build, the gear, and the mileage: [URL="http://www.jeepforum.com/forum/f22/wasteland-survival-guide-engineering-greta-1344782/"][B]The Wasteland Survival Guide[/B][/URL]