How to figure out rear end gear ratio

The left side of the calculator requires all three entries. For the Tire field enter your tire diameter in inches.

If so it would sure eliminate some of the possibilities when searching for a Jeep.

How to figure out rear end gear ratio. The proper rear-end gear ratio can be selected using the following simple formulas whether using a direct-drive 1to1 or overdrive usually 30 transmission. FIGURING TIRE DIAMETER Height FORMULA. Tire Size 254 x Aspect Ratio x 2 Wheel Diameter Tire Diameter in Inches Height.

How to Calculate the Rear Axle Gear Ratio Step 1. Slide a floor jack under the rear of the vehicle and raise it until the rear wheels are off the ground. Crawl under the vehicle and locate the drive shaft where it attaches to the front of the rear axle.

Place a 6 to. Place a piece. Determining a Rear Axle Ratio of a Posi Rear Safety first.

Chock the front tires so your car wont slide off the jack stands then raise the rear of the car with a. Turn the drivers side tire a quarter turn counterclockwise to remove the slack in the drivetrain. With a piece of chalk or masking.

Differential Gear Ratio Calculator. Enter the number of teeth on your ring and pinion gear set to find the gear ratio. Ring Gear Pinion Gear Ratio.

Calculate Rear End Gear Ratio needed. Todays date is 252021 Calculate your Rear End Gear Ratio Needed. Back to Calculators Index.

Gearing for the strip To find the ideal gear ratio for drag racing use your RPM at peak HP. If your max HP is at 6300 RPM use 6300 for. Turn the wheel 2 complete turns.

• Count the turns on the drive shaft. If it takes about 2 and three-quarters turns its around a 273 gear ratio. If its a little more than 3 you have 308s.

If it takes about 3 and a quarter turns of the driveshaft you have 323 or 325 gears. The gear ratio is the difference in the size of the pinion gear or input gear and the ring gear or output gear. An example of this would be a gear ratio of 21.

This would mean that the input gear would have two revolutions and the output would have one revolution. This results in a multiplication of torque or the turning force at the wheels. Select the value you want to solve for.

For the Tire field enter your tire diameter in inches. If you know your gear ratio then this doubles as a Vehicle Speed Calculator Just type in your info press calculate and youll get the right gear ratio without the guesswork. Another way to easily calculate gear ratio is multiplying 12 by your new tire size for example 1238456.

You may also calculate rear axle gear ratio by dividing pinion gear tooth count by ring gear tooth count. Tire specifications have a three number format 27575R16. Step 1 Find the VIN of your vehicle.

It can be found on the sticker on the inside of the drivers side door or on a stamped metal plate embedded in the dashboard above the steering wheel. It also is on your vehicles title. You should be able to find your gear ratio listed on the axle tag however if that has gone missing you can simply count the number of teeth on each gear and divide the number of ring gear teeth by the number of pinion gear teeth.

Ring Gear Teeth Pinion Gear Teeth 41 11 373. Providing the Jeeps rear end hasnt been changed out is it possible to identify the gear ratio 321 373 etc from the VIN. If so it would sure eliminate some of the possibilities when searching for a Jeep.

Before you even think about going to look at a particular Jeep youd know whether or not if it had the rear end gearing you were looking for. On this episode of Budget Build Garage we show you how to easily find the gear ratio on any rear end that has a posi unit without taking anything apart. Bigger tires are more functional look better and rob you of power.

One way to compensate for this is to swap out your differential gears. The left side of the calculator requires all three entries. The right side will show the results.

The New Ratio box will show the ideal gear ratio getting as close to stock as possible. Gear Ratio And Tire Size Calculator. When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power.

A good way to calculate this is to multiply 12 by your Jeeps tire diameter Example. 12 X 38 456. Here at Alloy USA we have a made an easy to read chart to help you decide what is on the best gearing for your Jeep.

To determine the vehicles overall First gear ratio we simply multiply the First gear ratio by the rear axle ratio eg 248 x 410 10171. The term refers to the gears in the trucks differential which is a mechanical device that links the rear axle to the driveshaft and then the engine. Technically the number should be expressed as.