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There are three ways to find a gear ratio.

1 A dealer can normally tell from the vin number.

2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement

info.

3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.

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Q: How do you find the gear ratio on the rear axle of a 1991 Chevy Astro?
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