What I'm hoping to hear is either a 2 letter or 3 letter code which is stamped into the axle tube on the passenger side and it will be on top of the tube. Your axle would have to be sanded a lot to obliterate that stamped in code. Probably possible to sand it off but unlikely. You have a truck rear end and it could have been made between 1962 and about 1980. The code is not always easy to see but it should be there. As I mentioned, mine's RA and that means 3.07 ratio. Look carefully under light. Two digit ratio codes were used up to a point (think this may have been around 1970, maybe 1972) and then the ratio was identified with 3 digit codes.
