need blueprint of hub..

[Fiskvik]

Hi! i'm a new member on this forum.
I come from Sweden so my english isn't so good. I have a silverado from 78 who is converted from 2wd to 4wd, the axels are from a blazer 84.

i'm fixing up the front axel and i need blueprint of the hub(automatic)so i can put it together. don't know the brand of it, it only has the letters 4x4 on the cap. can anyone help me find it.

// Henrik from Sweden