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Old 07-17-2005, 01:10 PM
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Reading ratio on crown gear

I always thought you could read the ratio on the crown by dividing the smaller number in the the larger one. The numbers stamped on the 9" Ford is C3AW-4210-CC-9x35. This one was supposed to be a 3.30 according to guy that has them the other set has C3AW-4210 and that's all the numbers and it's suppose to be 4.11. Does'nt jive at all for these two. Anything I'm missing or is there another way to locate this.

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Old 07-17-2005, 01:39 PM
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gears

If you have a 35 tooth ring gear with a 9 tooth pinion gear. It would be 35/9=3.88. For a general idea of ratio without removing rear end. Put a mark on the drive shaft and wheel. Turn the back wheel 1 full turn and count how many times the drive shaft turns.
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Old 07-17-2005, 01:48 PM
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Quote:
Originally Posted by western star

I always thought you could read the ratio on the crown by dividing the smaller number in the the larger one.

The numbers stamped on the 9" Ford is C3AW-4210-CC-9x35. This one was supposed to be a 3.30 according to guy that has them the other set has C3AW-4210 and that's all the numbers and it's suppose to be 4.11. Does'nt jive at all for these two. Anything I'm missing or is there another way to locate this.
The C3AW 4210 C is an engineering stamping no. to identify the actual ring gear. The 9X35 identifies it further as a 9" 35T gear (Not clear as to what the second C represents). There will also be a stamping on the pinion gear. This will further identify the two gears as a set.

If your first ring gear has a 10T pinion gear, you have a 3.50/3.56 ratio. A 9T pinion gear will give you a 3.89. The crossover chart is in the MASTER PARTS CATALOG.
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Old 07-17-2005, 06:23 PM
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