Rear end ratios...why the difference?

[Warren F.]

Can someone explain why Chevrolet had similar ratios, some the same and others so close to each other?

For example: Corvette 3:08 Camaro 3:07

3:36 3:31

3:55 3:55

3:70 3:73

4:11 4:10

4:56 4:56

Thanks

[Duke W.]

Re: Rear end ratios...why the difference?

Different gear tooth counts depending on the axle design. For example, the 4.10 ring and pinion on the Camaro axle is 41:10. The 4.11 Corvette ring and pinion set is 37:9.

As a general rule for similarly sized gear pitch diameters, the larger the tooth count, the higher the torque capacity because the load is spread out over more tooth contact area.

Duke

[Duke W.]

Re: Rear end ratios...why the difference?

Different gear tooth counts depending on the axle design. For example, the 4.10 ring and pinion on the Camaro axle is 41:10. The 4.11 Corvette ring and pinion set is 37:9.

As a general rule for similarly sized gear pitch diameters, the larger the tooth count, the higher the torque capacity because the load is spread out over more tooth contact area.

Duke

[Warren F.]

Re: Rear end ratios...why the difference?

Thanks for the explanation, Duke.

Could you give me another example using the Corvette 3:70 vs Camaro 3:73?

[Warren F.]

Re: Rear end ratios...why the difference?

Thanks for the explanation, Duke.

Could you give me another example using the Corvette 3:70 vs Camaro 3:73?

[Duke W.]

Re: Rear end ratios...why the difference?

The Corvette 3.70 is 37:10. Off hand I don't know the count for the Camaro 3.73, but 11 x 3.73 = 41.03, so it's probably 41:11.

Drive pinions typically have 9 to 14 teeth. A 10 tooth drive pinion will always yield a zero in the hundreths place. Those are easy. To guess the tooth count for other ratios, multiply the ratio by different drive pinion tooth counts until you come up with a ring gear count that is within .05 of being an integer.

Duke

[Duke W.]

Re: Rear end ratios...why the difference?

The Corvette 3.70 is 37:10. Off hand I don't know the count for the Camaro 3.73, but 11 x 3.73 = 41.03, so it's probably 41:11.

Drive pinions typically have 9 to 14 teeth. A 10 tooth drive pinion will always yield a zero in the hundreths place. Those are easy. To guess the tooth count for other ratios, multiply the ratio by different drive pinion tooth counts until you come up with a ring gear count that is within .05 of being an integer.

Duke