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Determining a Rear Axle Ratio of a Non-Posi Rear Jack one wheel off the ground, put the transmission in neutral and take the parking break off. ***Be sure to use jack Mark the wheel and the drive shaft with chalk or masking tape. Turn the wheel TWO revolutions and . Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a gear ratio. If you get approximately 2 3/4 revolutions, you have a gear ratio.
By following these directions, you can determine what the axle ratio is in your car. My Cart. Currency USD. Sign In Create an Account. Contact Us. Upcoming Shows. Superior Engineering. Tremec Transmissions. Why Buy from Us? Clutches Ford. SST Brand. Electric Power Steering Ford. Licensed Merchandise. Rear Axle Assemblies. Shifter Handles and Knobs. Stock Shifters and Accessories.
Transmissions - Bare. Tech Articles. Customer Testimonials. Parts Finder. Please Select Reset Find. Categories: SST Blog. Tags: tech articles. Chock the front tires so your car won't slide off the jack stands then raise the rear of the car with a calulate floor jack and place heavy duty jack stands on either side of the rear axle housing.
Lower the car onto the jack stands. Turn the driver's side tire a quarter turn counterclockwise to remove the slack in the drivetrain. With a piece of chalk or masking painters tape make about a 6" line along the driveshaft that can be easily seen from the side of the car and make another mark on the tire.
It's good to make this mark in a place that is easy to line up, like the edge of the wheel well or the 12 o'clock position. Rotate the tire counterclockwise while counting the number of times the driveshaft rotates until the tire has completed one complete turn.
You may need a helper if you can't rotate the tire and see the driveshaft at xbox 360 minecraft how to find diamonds same time. Rexr as accurate as possible. The number of driveshaft rotations will help you determine your rear axle xalculate.
For example, if it turned 3 and a half times, it's a 3. If it turned 4 and a quarter times, it's a 4. Remove the chocks from the front tires. Determining a Rear Axle Ratio of a Non-Posi Rear Jack one wheel off the ground, put the transmission in ot and take the parking break off. Turn the wheel TWO revolutions and count the number of driveshaft turns. For better accuracy, turn the wheel 20 times and divide by 2 for your rear axle ratio.
If you are unsure whether you have a Posi Rear or not Jack both what does bce and ad mean off the ground and turn one wheel. If the opposite wheel turns the same direction or doesn't turn at all, then the rear axle is posi or limited slip.
If the opposite wheel turns the opposite direction, then it's probably an open rear axle non-posi.
Your vehicle will probably run at different RPM’s than those you calculate. See What gear ratio do I need in FAQ for a discussion on choosing a ratio. Find all of the gear ratios available for your vehicle in our Application Guides. Need help? Our gear and axle experts will be happy to assist at () Aug 28, · When it comes time to buy a used vehicle, a lot of cases you want to know what the axle ratio is on either the front, or rear, or both axles. The method to. Feb 05, · In order to calculate axle ratio, you would count the number of teeth on the ring gear as well as the number of teeth on the pinion. Divide the number of teeth on the ring gear by the number of teeth on the pinion in order to determine the axle ratio of a truck.
Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. Installation of the correct ring and pinion gear ratio will help optimize performance, fuel economy and overall driveability. In order to select the ideal differential gear ratio, the first thing you will need to know is your actual tire diameter. The simplest method is to measure the height of the tire from the ground to the top of the tire.
Using the calculator below and the numbers in this example, the calculated value will be The calculated value should be used only as a guideline for RPM calculations. Tires with identical specifications that are made by different manufacturers may have different actual diameters. In the example above, 30 might not be completely accurate. Need help? Our gear and axle experts will be happy to assist at You can try various combinations to come up with an appropriate combination of ring and pinion gear ratio and tire diameter for your vehicle.
The RPM calculator should be used as a guideline for comparative purposes only. Find all of the gear ratios available for your vehicle in our Application Guides. We have the Differential Gears to match your budget and performance needs.
Enter the number of teeth on your ring and pinion gear set to find the gear ratio. For the fastest service, call our Differential Parts Experts at for immediate assistance. For inquiries about our products and services, please fill out the form below.
We look forward to serving you! Your Name required. Your Email required. Your Message. Skip to content Featured Products and Specials. Differential Gear Ratio Calculator. Tire Diameter Calculator In order to select the ideal differential gear ratio, the first thing you will need to know is your actual tire diameter.
Our gear and axle experts will be happy to assist at Tire Diameter Calculator. Tire Width mm. Aspect Ratio Tire Series. Wheel Size inches. The Tire Diameter:. RPM Calculator. Gear Ratio. Tire Diameter. Gear Ratio Calculator. Ring Gear:. Pinion Gear.
Your gear ratio is. Order by Phone. Need your parts ASAP? Contact Us.