Wrong - that is a myth


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Posted by Clint Dixon [216.248.73.1] on Wednesday, February 01, 2012 at 12:24:29 :

In Reply to: Re: You are correct, 5.83.....ntxt posted by w200Tim [76.21.94.88] on Wednesday, February 01, 2012 at 11:49:48 :

The front is not always a lower ratio. When you are talking the same model axle in the front as the rear - they are ALWAYS the same.

Only when you are talking different model axles front and rear can they be different ratios - and they are never different on purpose. They are only different when the physical sizing on the ring and pinion gears prevents a perfect match. For instance, you may have an 8-inch ring gear on the front and maybe an available ratio that can be cut into that diameter is 4.09. You might not be able to get the correct number of teeth on that diameter to create say a 4.10 or a 4.11. It may be physically impossible. The same truck may have a 9-inch ring gear on the rear. You may physically only be able to cut the correct number of teeth for a 4.11 ration on that. So the numbers end up not a perfect match like they should be, but close enough to not cause any great problems.

A good example of the above discrepencies would be a Spicer 30 under the front of a truck and a Spicer 53 under the rear - a 44 under the front and a 60 under the rear, etc. Fords, Chevys, and Jeeps typically have missmatched ratios front to rear because they historically have bought their axle assemblies from outside vendors. When you are talking WWII and later Dodge military trucks, WDX-WM300 model 1-ton Power Wagons, W300 models, and some W500 Power Wagons, the fronts and rears are exactly the same ratio and the third members are interchangeable.

Junior




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