rear end gear and unit?

[dzbowtie]

hey guys, i have a 70 c10 2wd that was originally 3 on tree with inline 6. before i pulled the rearend cover, i had assumed that the ring and pinion was a 410 set due to the inline 6. when i pulled the cover and let all the muddy looking gear oil out, i noticed on the ring gear it was stamped 3817778 11-41 gm. i figured that stood for teeth count on the set, but i counted anyways. infact, i counted 11-41 teeth on the set which was 3.73 instead of the 4 range. can anyone tell me by looking if this carrier is a posi, limited slip, etc. i honestly dont know what im looking at when it comes to these. thanks for any help guys. also, i noticed that the actual ring gear had what looked like white paint marker on it which read "E403" any ideas?