Can someone help me identify the rear axle of my 1974 Chevy K10? I tried searching for what these identification numbers mean, but cant seem to find anything. Would an axle like this be original on a 74 Chevy K10, or might it have been a swap?
On the front driver side, it looks like theres a "GM 55" stamped into the axle.
Above the "GM 55", there looks like a dial of some sort :
Finally, I see these identification numbers on the rear passenger side webbing. It looks like a "CON?". I can't make out the 4th character. It looks like a deformed 2, but I doubt thats it.
This is a photo of the diff cover: