# How Do I Know What Gear Ratio I Need?

How do I know what gear ratio I need? The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.

Secondly, How do I find the best rear end gear ratio?

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. For better accuracy, turn the wheel 20 times and divide by 2 for your rear axle ratio.

Also to know is, What is the best gear ratio? 1 to 1 or direct gear, is always the best gear for fuel mileage, quietness, cooler temperatures in the transmission, and more pulling power. However, to run in direct gear, the rear gears must be either 2.64, 2.47, 2.21 and I think there is even a higher gear than the 2.21. The average speed today is 70 miles per hour.

Similarly, How do I determine my axle ratio?

Method 1: Count the number of teeth on the ring gear and the pinion. Divide the number of the ring gear's teeth by the number of the pinion's teeth. This will give you the axle ratio.

How do I know what rear end I have?

## Related Question for How Do I Know What Gear Ratio I Need?

Can you change axle ratio?

You can change the axle ratio, and you can do it rather easily. Quite a few members here have gone from one ratio to the next. People with 3.21 and 3.55s are going up to 3.92 and even sometimes 4.10. A lot of the 4x4 trucks you see here with lifts and larger tires have gone with 4.10 or 4.56.

Should gearing ratio be high or low?

A gearing ratio lower than 25% is typically considered low-risk by both investors and lenders. A gearing ratio between 25% and 50% is typically considered optimal or normal for well-established companies.

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

So an easy way to determine your actual gear ratio is to check the tag attached to the differential cover by the cover bolts. On the tag there should be some numbering such as 3.54 or 3.73, either of those numbers will give you the stock axle ratio.

How do I tell what gear ratio my Vin is?

How can you tell the difference between a 7.5 and 8.8 rear end?

The top and bottom of the 7.5-inch gasket are straight with rounded sides. The 8.8-inch gasket has flat sides, top and bottom, with rounded corners.

How do you tell if you have a 7.5 or 8.5 rear end?

Another way to tell the difference between an 8.2 and an 8.5 rearend is to pull the cover and look at the bolt holding the spider gear crosspin. If it takes a 1/2-inch wrench to remove it, it's an 8.2. If it takes a 5/16-inch wrench to remove it, it's an 8.5.

What axle do I have?

Stamped Number on the Axle

To figure out exactly what axle you have, you can look for the Dana stamped bill of materials number. This stamped number can usually be found on the righthand side or on the longer axletube on the same side of the tube as the differential cover, facing the rear of the truck.

What RPM should my car be at 80 mph?

You should be at around 3300-3400 rpm at that speed.

How high should rpm go when accelerating?

This range differs from one car to the next, but in general, having your RPM hover between 1,500 and 2,000 when you're driving at a consistent speed is a good benchmark. You shouldn't worry too much if it occasionally goes higher or lower than that.

What's better 3.92 or 3.21 gear ratio?

From the speed 0-30 MPH, 3.92 has higher final drive ratio over 3.21 (18.46 vs 15.12) until it has to shift to 2nd gear at 30MPH. From the speed 31-38 MPH, 3.21 has higher final drive ratio over 3.92 (15.12 vs 12.31) until it has to shift to 2nd gear at 38MPH.

What are 3.21 gears good for?

The 3.21 hits 60 right after shifting into 3rd. - towing: for trailers at or under 8k, the 3.21 is fine. Yes it will operate one one gear lower pretty much the whole time, and be a little slower from a stop, but easily plenty of power.

What is the best gear ratio for towing?

FACT: A 4.10 axle ratio is ideal for towing heavy loads in a mix of city and highway driving and when towing on varied or steep grades. A 4.10 axle ratio will provide improved acceleration in stop and go city traffic.

Is 3.31 or 3.55 axle ratio better?

Normally, the 3.31 would get you better gas mileage, on highway. But, with the 3.55 you will get a bit more pulling power so less time at higher RPM to get your trailer moving and when going uphill. If most of your towing is flat highway, the 3.31 should do you fine.

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.

What's the difference between 3.15 and 3.55 gears?

The 3.55 will make the gears seem shorter meaning you will shift more often. The trade off is faster acceleration for less gas mileage with the 3.55's and vise versa with the 3.15's.

What is the best gear ratio for 33 in tires?

TJ Expert. For your transmission and tires, 4.88 is the recommended ratio.

What is a 410 gear ratio?

If the gear ratio of the ring-and-pinion is 4.10:1, then the output torque is 410 lb-ft (100x4. 10). Similarly, if the gear ratio is 3.08:1, then the output torque will be 308 lb-ft. It's easy to see that the lower 4.10:1 gears put more power to the ground than the higher 3.08:1 gears.

How is AAT gearing ratio calculated?

Gearing ratios

– Total Debt/Total Equity or D/E. – Total Debt/Total Debt plus Total Equity or D/(D + E).

How can I improve my gearing?

• Selling shares. Releasing more shares to the public to increase shareholder equity, which can be used to pay the company's debt.
• Converting loans.
• Reducing operational costs.
• Increase profits.

• Can you have a negative gearing ratio?

Stockopedia explains Net Gearing

If the value is negative, then this means that the company has net cash, i.e. cash at hand exceeds debt. The gearing ratio shows how encumbered a company is with debt. As a general rule, net gearing of 50% + merits further investigation, particularly if it is mostly short-term debt.

Where is the gear ratio stamped?

Check the Differential Cover

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.