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There are four ways to find a 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.

4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.

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Q: How do you figure out rear end gears ratios?
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Whats the Gear ratios for a 72 challenger?

The 72 Challenger had 3 different gear ratios depending on the motor the car came with. If the car came with the 225 or 318 cu. in. motor it had 2.76 or 3.23 gears in the rear end. If it was a Rallye Car with the 340 cu.in. motor it had the 3.23 or 3.55 gears. The approximate ratio can be determined by marking both the a wheel and the driveshaft; turn the wheel one complete turn and the number of times the driveshaft rotates is the ratio of gears in the rear end.


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