Gear Ratio: How to Calculate, Find by VIN & Change Your Final Drive
The math behind the gearing - calculate, decode by VIN, and change your final drive ratio.
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About the Gear Ratio Hub
How to calculate gear ratio, what gear ratio means, finding ratio by VIN, and changing gear ratio on FWD cars.
Key areas include: calculate, explained, find by vin, change ratio. Select any topic above to browse dedicated, in-depth articles - from cost guides and symptom diagnosis to step-by-step repair and rebuild walkthroughs.
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FAQ
Gear Ratio - Common Questions
How do you calculate gear ratio?
Divide the number of teeth on the driven gear by the number of teeth on the drive gear. For a ring-and-pinion, 41 ring teeth divided by 10 pinion teeth gives a 4.10:1 ratio, meaning the driveshaft turns 4.1 times per wheel revolution.
What is a gear ratio?
A gear ratio is the relationship between the number of teeth on two meshing gears. It determines how many times the input gear turns for each turn of the output gear, balancing torque and speed.
How do I find my gear ratio by VIN?
Request a build sheet from a dealer using the VIN, or decode the axle code printed on the driver door jamb sticker or in the glovebox. Counting driveshaft revolutions per wheel turn also works on a lifted vehicle.