Re: 33\'s or 35\'s?
OK...I'll help you....
Your front Dana 30 has a small ring gear and pinion, as well as bearings. The axle ujoints are tiny. 35's will eat this axle alive if you are aware your Jeep has a gas pedal.
Your rear axle, the Dana 35c, is great with stock tires, but it ENDS there. It uses c-clips to retain the axleshaft...so if you break a shaft, or this clip, you are riding a trailer or a flatbed all the way home. The rig gear is again small and weak, and the housing isnt known for its durability. Again, 35's will eat this axle alive as well.
You MIGHT be able to do the 33's on them, but forget about lockers, and go EASY on the gas pedal.
Essentially, if you want to actually USE your jeep, not just drive up and down main street, and want to run tires larger than 31s, and/or traction devices...you are going to need to replace your axles. Yes, some guys will say that you can "upgrade" the ones you have....but...at the end of the day, its still a D35C....and you'll spend as much or MORE to make it comparably strong to a D44 or a Ford 9", even an 8.8".