# What gear ratio is my differential?

Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio. Note: you may need to round off the number.

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## What ratio is my rear diff?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

## What is final drive ratio?

The Final Drive Ratio is the ratio of how many times the pinion rotates for every rotation of the car’s wheels. The higher this number, the more times the pinion rotates per turn of the wheels, producing more torque and acceleration but less top speed.

## How can I tell what gear ratio I have without pulling cover?

With the transmission in neutral, rotate the rear driveshaft by hand. Count the number of driveshaft revolutions required for one revolution of the tire. If the driveshaft turns approximately 3-1/2 times, you have a 3.54 ratio, etc.

## Does higher gear ratio mean faster?

A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration. . Besides the gears in the transmission, there is also a gear in the rear differential.

## Are 3.73 gears good?

They were terrible for the powerband of the V10, which is very high. The 3.73 gears kept the engine OUT of the powerband more often than in it and it made for a miserable towing experience and poor fuel mileage. I switch to a 5.13 gear set and found 1 more mpg when towing and had much better towing performance overall.

## What is a high gear ratio?

Gear ratios can be boiled down to a single statement: Higher ratios (with a lower numerical value) give better torque/acceleration and lower ratios allow for higher top speeds and better fuel economy. Higher ratios mean the engine has to run faster to achieve a given speed.

## What gear ratio do I need for 35 inch tires?

That’s why I run a 4.56 gear ratio with 35″ tires. This gives me decent fuel efficiency at highway speeds, and enough low end power to throttle through difficult obstacles.

## Can you change diff ratio?

To counteract the effects of larger tires, you can change the gears in your differential(s) to increase the ratio of how many revolutions of the driveshaft it takes to make one full revolution of the wheel (raising the engine rpm at the same speed).

## What do differential ratios mean?

Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio.

## How do you know if a differential ratio is e36?

While turning the wheels full 360 circle, count how many circles the drive shaft does and you will get the differential ratio on any car. You can also do it with the diff on the car and the rear in the air or just the differential on it’s own.

## How do I choose final drive ratio?

To find the ideal selection, multiply the final drive ratio by the redline speed in fourth gear (152 mph) and divide that by the top track speed (140 mph). This would yield a theoretical 3.33—which is close enough to the nearest available final drive ratio of 3.36:1.

## What gear ratio is best for speed?

For flat places, a ratio of 2.6 to 3.0 is ideal for most people. The lower value of this range, with a cadence of 90 rpm, will allow us to ride around 30km/h, while the upper, 34km/h. If you’re just starting out on your adventure on a single speed or fixed gear bike, a gear ratio of around 2.7-2.8 will be ideal.

## Can you change the final drive ratio?

Changing final drive ratio is incredibly easy in a rear wheel drive car, all you have to do is swap out the differential for one with a different ratio. However changing the ratio of your overdrive for better fuel economy would be so expensive and difficult that I would implore you to not even think about it.

## Where is the gear ratio stamped?

The axle may have a sticker, and on the differential cover, you might have a small metal tag that’s sticking out that will have the gear ratio stamped on it.

## How do I find the gear ratio of my car?

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).

## How do I know what differential I have?

The most accurate differential identification is provided by the bottom line of the tag number or axle tube stamp. Differential tags can easily be used to identify Dana and Ford differentials.

## Are 3.73 or 4.10 gears better?

While it might seem like shorter gear ratios like a 4.10 gear is the way to go, you might also want to consider the following: The higher the ratio, the higher the RPM at highway speeds. Not only will you accelerate faster, but it will also result in much higher RPMS while cruising and some may not want this to happen.

## What rear axle ratio is best?

The most popular rear end ratio in trucks today is the 3:55, which sort of averages towing power and fuel economy. This is a good ratio for the occasional towing or hauling individual. For a person who tows more often, and heavier loads, the 3:73 or 4:10 may be more appropriate.

## What does a 3.73 gear ratio mean?

This number is shown in the ratio, which represents the number of the ring gear’s teeth divided by the number of the pinion’s teeth. If a truck has an axle ratio of 3:73:1, for example, the driveshaft turns 3.73 times for each full wheel spin.

## WHAT WILL 4.10 gears do?

Lower 4.10:1 gears would make the engine turn 4.10 times for each turn of the tire, so lower gears cause higher engine rpm at any road speed.

## What is a 4.10 axle ratio good for?

Pickups towing big 5th wheel trailers do well equipped with 4.10:1 axle ratios. The thinking behind the decision to stick with the base axle ratio, which is typically 3.08:1 or 3.42:1, is the ratio comes standard, so that’s what the vehicle manufacturer feels is the best setup.

## Is 3.55 or 3.73 better?

PERFORMANCE: The larger the axle ratio number, the quicker the truck will accelerate. For example, a truck equipped with 3.55:1 axle gearing will accelerate faster than one equipped with a 3.31 axle ratio. Similarly, a pickup with a 3.73 axle ratio will be faster than one with 3.55s.

## Is a bigger differential better?

The lower the number, the faster the car will go with the same number of engine revolutions. The higher the number the better the car will accelerate, but at the expense of high speed cruising.