Engine, rear gear, Tourque Converter, Tire size info/question for the experts

Here's 4.11 and 3.55 difference, everything else being equal: Here's the website for you play around with different gear ratios and tire sizes: Calculate RPM for Given Speed(MPH), Rear Gear Ratio, and Trans Gear Ratio Is it worth the cost of a gear change worth 400 rpm? Your motor will know the difference between 3.55 and 4.11, speaking from personal experience. As I said before, it comes down to what you want and what you're willing to compromise. "What you're willing to compromise" covers a LOT of things: Top end, acceleration, gas mileage, money, on and on and on. Only you know what you want.