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I just put mine at 4 or 8 and filled until I seen oil start to run and then plugged.

So what I'm reading is when the truck is in a level position, add differential gear oil to the back axle in the fill hole in the center of the axle. No need to check the two cap plugs. BUT on the front axle check the differential oil AND the end caps for the proper level of oil.

If you have a 8 mm hex, it worked good for me. I was told to put the plugs at either 4 or 8 o'clock 12 being straight up.

Do you check the hub oil level when the plugs are at either 9 or 3 o'clock?

This brings up a question... Does the differential oil in the axles, lubricate those bearings and gears? or does one need to repack the wheel bearings? I really hope the heavy oil lubricates everything in the axles.