Have two Danas that I did a search for information on and could never find out what they were out of. I think the number begin with 27. One is in a 1971 Hemi Cuda that was raced and the Dana has 538s and the good Lock Unit.. The other has Ladder bar brackets and the perches are move just like the first one and I could not find those numbers either.and need to take the cover off to see just what is inside. The second Dana we were told it was a 1971 but the numbers do not add up and they do not added up on the first Dana. Will have to go and collect the numbers again this weekend. I have seen 1972 B Bodies with Danas and they must be rare to find.