Im answering this becuase of your other post wondering why no one is answering. First off, these questions have been asked a million times which is probably why no one cares to answer them much more. The search feature isnt the best, but google usually brings up jeepforum as well.
My driveshaft blew out on a 2" BB within 50 miles. On a 4" lift, id bet it will be less than that so replace it ASAP.
Can you fit 33's without trimming? Depends on wheel width and backspacing. But chances are NO. Im running 33's at 4.5" and had to fully trim the rear to get the tire to stuff. The front required major trimming to the wheel welll near the bumper, and Im trimming the fender upward just for good measure and the ability to steer lock to lock at full bump.
[URL="http://www.jeepforum.com/forum/f197/tjs-01-wj-build-thread-1023461/"]4.5" Claytons, 33's, 231hd, locked, and more. Click here for details[/URL]