Common questions

# What is the optimal gear ratio?

## What is the optimal gear ratio?

By using a heuristic rule which finds the least number of gears and the most efficient gear ratio under the given physiological condition, a four speed gear system with the ratio of 0.26–0.38, 0.38–0.53, 0.53–0.7 and 0.7–1.0 is recommended as the most efficient gear system.

How to calculate the rear end gear ratio?

FIGURING REAREND GEAR RATIO (Ring & Pinion) FORMULA: Engine RPM @ Cruise / Tire Revolutions Per Mile = Rear-end Gear Ratio. EXAMPLE Without Overdrive: 1800 RPM / 656.93811 = 2.73:1. EXAMPLE Without Overdrive: 2000 RPM / 656.93811 = 3.04:1.

Why do Mustangs have longer rear gear ratios?

Road course Mustangs tend to have longer rear gear ratios, which means less time shifting. That is a loaded question. It all depends on what you plan on doing with your Mustang and what other modifications you plan on adding.

### How does rear gear ratio affect your mpg?

Changing your rear gear ratio will either have a positive or negative effect on your mpg. Higher gears will reduce your mpg, lower gears will increase it. If your Mustang is your daily driver, this can be a big consideration. It’s because of fuel efficiency that most Mustang owners select a middle-range gear.

How big is the rear differential on a Ford Mustang?

A professional will also be able to help you address some of the other important rear gear considerations. To select new pinion gears, you’ll also need to know your Ford rear differential size. Since 2011, V6 and V8 Mustangs have used Ford’s 8.8” rear end, but before that many used a 7.5” rear.

FIGURING REAREND GEAR RATIO (Ring & Pinion) FORMULA: Engine RPM @ Cruise / Tire Revolutions Per Mile = Rear-end Gear Ratio. EXAMPLE Without Overdrive: 1800 RPM / 656.93811 = 2.73:1. EXAMPLE Without Overdrive: 2000 RPM / 656.93811 = 3.04:1.

What are the rear end gears fuel economy?

Rear End Gears Fuel Economy. This is the ratio of gears in the rearend (differential) that you may have heard of in the numerical terms 2.73 to one, 3.23 to one, 3.55 to one, 3.73 to one, and 4.10 to one (commonly written in the following manner 3.23:1 with a colon). These numbers specifically relate the ratio of the speed at which…

## What are the numbers on the rear end differential?

These numbers specifically relate the ratio of the speed at which the pinion gear rotates to that of which the larger ring gear rotates within the differential.

How do you install rear end differential gears?

Installing a new set of rear end gears is commonly known as one of the most difficult automotive tasks to accomplish. It requires precise measurements when lining up the contact area of the two gears and must be redone several times if they are not lined up properly.

Ruth Doyle