The sprag was ripped out of the 904 by a mini neutral slam that was not intended, so im kinda gun shy about 904's the converter I had in the 904 was a 2800 stall 11in turbo action. The only reason im going with a 727 is its a more reliable transmission or so I hear, it will still be a 11in converter but a 3200 stall. Before the trans. crapped out on me I had the car out at a 30mph roll and I was fairly impressed so I know its making power I just need to change a few things. I am hoping that the exhaust is ok the way it is, I guess I will find out in the spring time.