904 or 727 ?

The only thing I see that wasn't mentioned here which is the most important. Would be the weight of your car. 318's were installed in alot of different body cars . The deciding factor at the factory was. The weight of the vehicle. Maybe why all triucks and C bodies had 727's. 904's will handle the HP its the weight of the car that it don't like. If you have a stripped drag car go 904. Any car with High HP and weighs in the area of 3400. you should have a 727.

Not including the gear differences. The 904 does not increase power it increases torque do to the lighter reciprocating mass, So everything is smaller including the output shaft. and the pump drive. PG's are good too but you wouldn't put one in a full weight street car.

So what it comes down to is you as a driver and the HP per weight ratio of the car its going in. I have a 727 in my street weight High HP Duster. The way I drive I would have killed two 904's already. My 727 is in for three years of severe street driving with alot of launches and tire torching . I shift at 8500. It has a 5500 stall with 456 gears and 29x14.5 Hoosiers. . I have 904's if needed. LOL. so this advice is doing nothing but keeping them here.

At the track the 904 is safe there is guard rails and safety people. I wouldn't want to break a 904 on a street lined with poles or trees. This was the result of a trans failure on the street