Axles will be fine unless your doing jumps, have a locker, or doing a ton of wheelspin.. If you are spinning your tires offroad and they touch rock or pavement and get grip..boom, broken axle. Same concept with a locker..spinning and suddenly not, but the gears still are.. or the gears start moving before the tire can spin. Impact-damage.
Check the gears.. you will for sure be fine but just to releive stress off the engine/trans you would want a 3.73ish axle gear.. Otherwise if you get onto the pedal hard before the truck can get moving, your going to fry something.
if you have 2.73 or 3.08s, if you have the money you will definetly be better off with 4.10.. If you have 3.73s your fine untill you go bigger. 3.42s..if it still feels underpowered and stressed for your taste, go with 4.10 later on. (4.10 is the most used axle gear for 35s with your truck..best for all around performance including highway)
OH, i just remembered you have a 12bolt rearend.. Even better!! But the impact theory still applys.. your 10bolt front will be fine as its not your normal power axle and rarely has stress..
Remember, im on 2.73s and it does still move..its just stressfull to the rest of the truck which could lead to damage later on, plus its sluggish as hell. Ill be regearing to 3.73 as my truck's engine has a little more power than yours, and i want good highway milage.