I have a 1997 Jeep Grand Cherokee with a 5.2. I am experiencing problems with the 4x4. The front Drive-shaft spins however its not making the front tires turn. What could cause this?

If the driveshaft is turning then you need to check both axles to see if they turn. If you see that an axle is turning but the wheel is not, you have a broken "u" joint or c/v joint (I think either was available on that year.) If neither axle is turning then likely you have broken some gears inside the differential. To verify that remove the cover on the diff and look. Broken gears are obvious and you do not need to be too experienced to see the damage. Gear damage is expensive to repair and you cannot do that work yourself. You can replace an axle or the entire differential, end to end. Instructions can be found for axle and complete diff replacement in both chiltons or haynes manuals. Or you can try it without instructions ans ask me if you need help with any part of the job.