If I read the code correctly "SC" my 68 442 came with a open end 3.08 rear. I was able to find one vendor that sells a replacement posi carrier. From what I can find thru research it is really a 8.8 ford unit that has been machined for the 67-70 "O" type rears. Just wondering if anyone has any additional information or has actually purchased and installed one of these units. Thanks! Jim