I replaced the front axle disconnect on this same truck in another thread on here a few years back. I have only drove the truck 30k since then. The front diff has had a leak since I have owned the car. I can't keep it filled. Overall, I have driven the car 112K since I bought it.
When I started this project, I put the car up on jackstands so that all four tires are off of the ground. I switched over to 4-hi and only the back wheels and the front driver side is turning. Got under the car with a stethoscope and the grinding noise while the tires are spinning is coming the loudest from the differential.
Since then, I have tore down both sides and removed both axles. It looks like the outer seal where the front passenger axle sticks into the disconnect has failed. There are also lots of bearings everywhere when I removed the axle out of the differential. I haven't pulled the differential yet but plan to in the next few days. I will attach a photo that I took of the differential with the axle removed. I'm guessing I'm going to have to somewhat rebuild the front axle disconnect along with either rebuilding or replacing the front differential as well.
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