I have a 2000 pound Daytona and with a PG, I could not get my car to 60 foot at all. Put in a A-1 Proflite and picked 2 tenths. My small block makes 835 Hp. I also ran the 904 when I was running low 9's in a 70 Cuda with the brake. Those tranny's hold up very well. I have 2 of those for sale, 1...