With 33s, I'd think you should be ok...just don't go crazy on the throttle off-road.
I run 35s with 4.56 gears, lockers, and wheel pretty hard...still not broken (knock on wood
But I've got a Ford 8.8 to swap in as soon
as I save a few more bucks.
If you go bigger then 33s, I'd consider an upgrage. Either the Superior Axle Super 35C kit...or an axle swap. The axle swap may even be cheaper, or close to the Super 35C.
Even so, you may start putting aside spare cash to prepare for the next upgrade