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That surprises me as well. I thought it would give you the same increase in torque throughout the rpm band. From all reports I have read that is the case anyway. It would seem to me that if the more aggressive final drive was running at a higher RPM at any given MPH over the stock final drive the more aggressive final drive would be faster until it tops out.
Example: In an FRS with a 4.55 FD you should be around 3400 RPM at 70 MPH. The stock 4.10 should be at 2900 RPM at 70 MPH. Just looking at the RPM's, the 4.55 should be able to pull on the 4.10 at 70 MPH because the car makes more power at 3400 RPM then it does at 2900 RPM. The gearing advantage should, in my mind, amplify this effect further.
If I am wrong, what am I missing?
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