HO52 fluid ???

[elswickaj]

HO52 fluid question....I recently replaced rear brakes and inner and outer wheel bearings and didn't do a proper brake adjustment. I installed axles and refilled the rear diff fluid. I then drove the truck about 30 miles and removed the axles again to adjust the brakes properly but this time there was no gear oil on the new bearings. The first time I removed the axles fluid was leaking from the axle tubes. I made sure to fill it up as much as possible. Sorry if this is a stupid question I just see full as full. Should I jack one side of the truck up and pour more in there? or is there a fill port on top that I cant see? I thought I looked it over pretty well.

Thanks in advance
Aaron
1972 k20
1968 c10 SWB in progres LS swap
1968 c10 Step side