If it's a track only car, I'd gear it to run the track you race at. Dought if you would see much differance going from 3.73s to 4.10s. But 4.56s are a bit much for the street. I run a 5.43 with 32" tires and a th350. I shift at 6200 and trap 6400 with my Grand Am. I broke the side out of the case last Sunday, destroyed the 9" ring and pinion. I'm going back with a 5.67 or a 6.00 and a pro case this time. Haven't made up my mind yet
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