If you have an automatic car...don't even think about getting anything but 4.10's. I just got mine installed, along with a custom SCT XCal II tune. 4.10's or BUST!!!!

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personally i like my 3.73's in my auto for the main fact of down shifting at a high speed
what is the fastest speed that you can get back to 3rd gear from 4th? mine is around 85-90
the only thing that helps my buddys rsx type s(for example) at 90+ if he jumps on it and im following i cant hang, but from a dead stop i will smoke him the whole way through either way try to save your tire$$$ and have fun

 

anyone have 3.90's in an auto? if so how are they