You sir are in a pickle.

Your situation is a tough one. I too know people who have wheeled 3.5" lifts for YEARS without changing a drive shaft...

Oddly enough, I also know a guy who did not wheel long and he broke his... It might have been his style though, he was goosing the throttle, which you SHOULD NEVER DO.

If you follow that rule, and dont act stupid offroad to impress people, I think you'll be ok. You'd be in more danger with at 2 door jeep.

With the unlimited, I say, go easy, and you should be fine. If the throttle is your answer to a problem off road, you should beef up your drive shaft, because you will break it.

Maybe going keeping the stock DS and knowing its a weak point will make you be more delicate with the gas pedal offroad. Pick a better line, use the lockers, DONT PANIC...

Or change the DS and go nuts.