Welcome.
Let's back up a little bit. First of all I hope that where you "play in the mud" is totally 100% legal. If it's not, that is very much a no-no.:nono:
I think it's beneficial to slowly let your Jeep grow. I did it this way and am very glad I did. You learn to be a better driver and learn to know your heep. If you are just wanting big tires and to go ballz to the wall, this really isn't the place for you IMHO.
You need to know what axles you have before you decide wheather or not you need to up grade. You'll have a D30 up front and either a CryCo. 8.25 or a D35 in the rear. Search around and you'll find a ton of threads on how to identify them. There is alot of great information here on

. All it takes is a little time to search it all out, it's already there, you just have to find it. Look for a bit and if you don't find it, ask. Don't expect to find exactly what you're looking for with the first thread that pops up. It does take a little digging sometimes.
Why do you think you need 35's? You're looking at ALOT of other mods that will be required to run 35's, with that comes a pretty hefty price tag. Does your budget allow for what is necessary to run 35's?
Not trying to discourage you, just giving you the facts.
Where in IL are you?
The MWC's largest event is coming up soon. Winterfest will be held in Attica, Indiana at Badlands Offroad Park. It'd be great if you could make it and meet some of the MWC guys and gals. It's always great to have new folks. Look in the Winterfest forum for more details.
Hale