What is the best gear ratio for street racing?

If it’s a daily driver, chances are you’ll want to keep your gear ratio at 3.23 or below for optimal performance and lower cruising RPMs. For street and strip applications, a popular choice ranges between 3.42s and 3.90s, giving you that extra oomph on the track while maintaining a tolerable cruising RPM on the street.

What is the difference between a 3.21 and 3.73 axle ratio?

A numerically higher axle ratio provides a mechanical advantage to send more of the engine’s available torque to the rear tires (and front tires, in a four-wheel drive vehicle), but you pay the price at the fuel pump. So, a truck with optional 3.73 gears will tow a heavier trailer than one with 3.55 or 3.21.

What gears make a car go faster?

If you swap in taller rear gears, you can gain some top-end speed, making your car faster, but you’re going to be a bit slower leaving from a stop. You’ll get an opposite result when you swap in shorter gears.

Are 373 gears good for racing?

The 373 makes all the gears shorter but it makes first really short. Kind of depends how you drive. that short first makes getting off from a stop really easy w/ no drama, but it’s probably not the perfect gear for max acceleration. OTOH the 373 makes 2nd and 3rd feel really strong.

Is a 3.92 rear axle ratio good?

But opt for the higher 3.92 axle ratio and that same truck packs a higher towing capacity of 9,930 pounds. A higher axle ratio (like the 3.92 we mentioned earlier) will allow for higher towing capability, but it requires higher engine rpm for any given speed and then results in lower fuel economy.

What gear should you be in at 40 mph?

An overdrive gear allows your car to cruise at a high speed while maintaining low engine revolutions. You’ll use 5th or 6th gear for highway cruising at speeds of 60 mph to 70 mph and are ideal gears for best fuel economy. You’ll usually change up from 4th gear into 5th or 6th gear at a speed of around 40 mph or so.