I have not measured the temp (infared heat gun) but after a few minutes (10-15 mins) the diff center is very warm but not burning hot (touch it with your hand).
I don't think I was clear with my description above, so let me clarify: After driving for 1 1/2 hours at 55-65 MPH, and then a 10-15 min cool down the center is very warm, but not "burning hot". Rear housing ends out by bearings are cool.
I appreciate the responses and I won't rule out heat/bad bearing. But, I'm not convinced, especially based on fluid level and where the vent is located. My next move will be to pull axles and third-member to check and re-lube.
