I think some people are confusing a stock transmission and race transmission. If you build either a 904 or 727 properly, they both hold up just fine. In STOCK configuation, the 727 is heavier duty and will hold up to more abuse than a 904 will. As mentioned, the 727 weighs more and kills more horsepower than a 904 does so it makes sense to build a 904 for RACE or heavy duty use. In STOCK configuration, a 727 might be a better choice in certain applications such as a heavy vehicle that is going to tow or haul something. I have a drag car with a 727 in it behind a small block and it works just fine. It hasn't had any problems at all. Is it the best choice for my car? Nope, but that's what the car came with when I bought it 6 years ago. I figured that when it does need to come out of the car, that's when I'll do the changeover. If I'm running a bracket car, what real difference does it make if I run 2-3 tenths faster with a 904. The idea is to be consistant....which it is.
