Gear Ratio and RPM deciding on gears

3.91 or 4.10 gears are no fun at all if you use the stock non overdrive trans and do any freeway driving. If you just run around town or race they are great. 3.23 is the best compromise in my opinion. If the car is a “dog” with 3.23 gears, a set of deeper gears won’t make that much difference.