Came from a 1973 GMC C30 truck. From what I know the gear ratio is 3.73. Didn't see a tag or anything however the input shaft pinion gear has 11 teeth on it and the ring gear has 41 teeth.
PLEASE NOTE the three socket head cap screws that hold the two halves together are missing, everything else is there.
The inside shim and clutch assembly does have spots where moisture had gotten to it and caused light rust. See the 4th and 5th pictures. Bearing races have discoloration from sitting a while. Everything else looks ok.
If any more pictures are needed please let me know and I'll get them soon as I can.