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I simply remove the rubber seal from the outer seal. As far as the inner seal goes I use CR seals from motion industries. It is rated to a higher pressure rating than the SKF seals. SkF seals are good to 450 degrees though. When I fill the differential I fill to the plug then install...

The washing away the grease would not have any effect on that. I run wet hubs on my M939 series truck and the hubs run cooler. I would rather not pack those bearings and let oil do the job over grease.

Your hand sensing 7 to 10 degrees warmer is very noticeable. Are bodies detect hot and cold differently and even a slight temp difference seems alot

verify with the IR gun. it is best it also helps determine other failures building up heat you can't hear or feel while driving especially in a deuce.

What is the temperature showing with the IR temp gun? Would verify the actual temp vs the others before chasing anything. Rear axle hubs will run slightly hotter then the front tandem hubs due to the weight the bogie uses while driving. Loaded in the bed the bearings should have about equal...