# Another Beginner Question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ArrowheadK5, Sep 1, 2001.

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Can different axles have different gear ratios? I now understand the ratios, but how are they integrated with the axles, physically??

Four wheel drive, four wheel expenses...

2. ### RedDwarf1/2 ton status

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The way the axle gear ratio is come up with is by changing the number of teeth on the pinion gear(what your drive shaft hooks to) and the ring gear (big gear inside the axle pumkin).

The pinion, being smaller than the ring, provides leverage. The amount of leverage is expressed as a ratio, and the exact number is determined by dividing the big number by the little number. eg: 41 teeth on the ring gear, 11 teeth on the pinion. 41/11 = 3.73 so the gear ratio for that axle is 3.73:1

Different axles may have different numbers of teeth, and therefore may not have exactly the same ratio, like a Ford 9" might use 37 teeth and 10 teeth to come up with a 3.70:1 ratio, where as the Dana 44 in the front uses 41 and 11 to get 3.73:1.
As long as the ratios are within about 1 or 2 percent of eachother, you're okay to use them together. Note, percentage is found by dividing the little ratio by the big ratio, as in 3.70/3.73 = .992, so those two ratios are less than one percent off. They can safely be used together without breaking drivetrain parts.