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This is to scale. The fill plug is further below the center line of the axle than I thought. The weld on the axle tube is a good indication of the CL in case you are wondering.

Here are pictures from the LO for the M915A1 which uses all modern heavy truck civilian style steer and drive axles. The front steer axle uses wet hubs. The oil level is not halfway up the spindle, it is below the spindle. The rear drive axles fill plug is below the axle center line...

Since I have taken 2.5 ton and 5 ton hubs apart and found they were full of oil (and running very cool by the way), I don't really think the axle oil level needs to be any higher than is it is. If you think about it, the ring gear is churning the oil up and it will flow out to the hubs. Also...

What 73m819 said. I pulled one of the front tandem hubs on my m929 to repair a brake issue. The hub was full of gear oil and I put it back together that way. I left the outer seal in (it was shot anyway) because I wanted a washer between the bearing and nut. I didn't install a seal in the...