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Feb
Ring Gear Pinion Gear Ratio. The New Ratio box will show the ideal gear ratio getting as close to stock as possible.
Enter the number of teeth on your ring and pinion gear set to find the gear ratio.
How to figure rear end gear ratio. 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 the RPM. Determining a Rear Axle Ratio of a Posi Rear.
Chock the front tires so your car wont slide off the jack stands then raise the rear of the car with a hydraulic floor jack and place. Turn the drivers side tire a quarter turn counterclockwise to remove the slack in the drivetrain. FIGURING REAREND GEAR RATIO Ring Pinion FORMULA.
Engine RPM Cruise Tire Revolutions Per Mile Rear-end Gear Ratio EXAMPLE Without Overdrive. 1800 RPM 65693811 2731 EXAMPLE Without Overdrive. 2000 RPM 65693811 3041.
EXAMPLE With Overdrive 30. 1800 RPM 65693811 2731 x 130 3541. 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. 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. 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. 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. CROSS SECTION WIDTH x 0ASPECT RATIO x 2 254 WHEEL DIAMETER OVERALL TIRE DIAMETER For Example. 23545ZR-1 235 x 045 x 2 254 17 25327 And heres a formula that you can use to calculate your vehicles rear axle gear ratio.
RING GEAR TOOTH COUNT PINION GEAR TOOTH COUNT GEAR RATIO. The rearend gear ratio refers to the relationship between the ring gear and the pinion gear. By simply dividing the ring gear tooth count by the pinion gear tooth count the ratio is determined.
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.
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. A gear ratio is calculated by dividing the number of teeth of the driving gear by the number of teeth of the driven gear.
Rear End Gear Calculator Axle ratio or rear end gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. To verify or to see if that ratio has changed you can jack up the rear axle and support it with jack stands. 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 3-12 times you have a 354 ratio etc. 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. In this episode of Budget Build Garage Nick explains and demonstrates the easiest way to determine rear end gear ratio on a open differential. The best part.
In the end its easy to see that mistakes in gearing can craft a truck load of trouble. The real key to optimum performance is to take the engine torque curve the transmission gear ratios rear axle ratio and tire diameters into consideration as a total package.