K20 rear axle leakage!

[1968_K20_4x4]

Hey all,

So the other day I noticed something was leaking from the drivers side of my rear axle. The truck is a '68 K20 and has the eaton HO52 axle. I noticed something had leaked all over the inside of my rear tire from inside the brake drum. I disassembled the axle and am not sure exactly what the problem is. Is it oil leaking from inside the axle? Could the seal be gone? I looked at the hub spindle and it looks pretty worn down. If so what can I do? Should I try replacing the seal and see if that fixes the problem? The seals were replaced only last year. I thought possibly brake fluid leaking but I do not see any evidence of this inside the hub. How can I tell for sure? I will upload pictures for analysis and appreciate any input on this issue. First picture is what the inside of the tire looked like. Second pic is the inside of the wheel hub/brake drum.