67 Barracuda Trans question

Why do you want to switch? Not only is the 904 a very good trans, but you will have to change the driveshaft, and possibly hammer the pinch weld in the tunnel for the 727 bellhousing to fit. Not to mention that you can get the later style 4 planetary gear cluster from an A-999 trans with the lower 1st gearset for the 904 to up your out of the hole response. Oh, did I mention the 5 clutch drum? A lot of guys are racing the 904, so unless you are considering something more than a race engine, the 904 should be all you need. JMO, but by the time you have a driveshaft made for the 727 and get it in, you would be miles down the road with the 904. Good luck with whatever you decide to do, Geof