That's about 2 1/2 quarts, IIRC. The fluid level should come to almost the level of the axle tubes, (the level of the fill plug) so a little of it runs down the tubes in a turn to keep the axle bearings lubricated. Some of the big rigs I worked on had seals on the axle shafts inboard of the hub bearings, and we packed them with heavy grease like front wheel bearings periodically, but the 1/2 and 3/4 tons used gear lube from the center housing for rear wheel bearing lubrication.
Jerry


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