I'm running the street richmond (4+1) behind a 550+hp 427 BBC with a C4 Dana 36 rear end. As others have mentioned you need to go easy on the take-off. I've found that once you get rolling you need to feel where your torque kicks in and play with it. Mine is about 3,900 RPM. The tires start to spin when I'm on it hard. I can see not messing with first gear. You really get through it fast. However, I've noticed that the Richmond shifts hard. I have blown many of shift and have gotten the trany stuck between gears a few times. I getting the hang of it but it is tight. 2nd to 3rd is my biggest problem. I may need more clutch release. Haven't tried that yet. All in all I'm happy with the trans. . . .