Marco, I got the other message you sent me. If the front driveshaft is turning but the wheels are not, you might have a problem with the hubs, or something broken in the front diff. Block the wheels and put the transfer case in neutral. Crawl under the jeep and turn the front driveshaft with your hand (with the front hubs locked in). While doing this, look to see if either of the front axle u-joints are turning. If the u-joints (front axle shafts) are turning, then you have a problem with the locking hubs.
Another 7 by "CJ's Heaven"