Once you have decided which side is broken and the axleshaft is turning, the next step is to remove the locking hub if your Jeep has ’em. Once you get it apart, you’ll see broken bits of the hub if that’s what failed. The inside toothed ring is the one that will most likely be broken. You’ll need to pull the bits out and replace the hub or broken parts. If you have no spares, it’s time to limp off the trail. If the hub looks fine, then you either have a broken axleshaft, differential, or ring-and-pinion. If you have spare axleshafts, it’s time to continue searching for what’s broken.