A904 vs A999

Thanks! the first thing that raised my eyebrows about this was when I blew the rings in the 360 and just threw an old 318 I had in her for a little while. The 318 was tired had a bit of blowby and a near dead hole. When it went in, it seemed to have way more power than it did in it's previous Dart host. Rear gear ratios in both were pretty close (2.72 I think). Even Dusted a 5.0 rustang lite to lite (not much of a challenge).
So I started wondering about the tranny.