Differences in 904's
It seems that some 67's also had the smaller input shaft. I went through the 904 in my 67 Dart and put a Mopar Performance convertor in it. Put the tranny in and it would not pull out of its tracks. I had air tested all the clutches and bands before putting in the valve body -- so I knew if any pressure was getting to the right places it ought to at least engage. I dropped the valve body to make sure I hadn't done anything stupid with it -- everything was in its place and free.
Pulled it back out -- the TC wa too big for my input splines. :-( Either had an early prodution 67 or a later tranny had been installed sometime in the Dart's past.
Brian