The question of 9 inch as opposed to 8 inch rear ends in "J" code cars has always made me crazy, and I strongly suspect that the GT option for some reason includes the 9 inch rear, although most look at me as an idiot when this is mentioned. I included this as one of the things that Paul N. might consider covering in his latest book when he recently asked on this forum for suggestions. This probably should be a stand alone thread as many will pass over it, and it is important. Just as Danny said, I am convinced at this point that for whatever reason most or maybe all "J" code cars that were purchased with the optional "GT" package came with the nine inch. Has anyone ever seen a document or notation in any Ford parts book or just anywhere official that this odd suspicion is true? Maybe Paul has done some research by now and can chime in on this. Can anyone provide an exception to this suspicion?