Replacing the pass. side front axle seal depends on what type of Jeep you have. If you have the
front axle disconnect, I believe the seal is just towards the pass. tire from the vacuum shift fork. If it's a solid pass. side axle shaft, the seal will either be next to the diff (a pain) or on the end of the axle tube closest to the knuckle.
To check the diff fluid, just pull the plug from the diff cover and make sure the gear oil is level with the bottom of the hole.[addsig]