Hombre S Regular Cab 4WD V6-4.3L (1999)
Drive/Propeller Shaft: Service and Repair
Calculating Propeller Shaft Rotation
The propeller shaft drives the tires through the rear axle. Knowing the rotational speed of the tires enables you to easily calculate the speed of the
propeller shaft. Therefore, you can determine the rotational speed of the propeller shaft by multiplying the rotational speed of the tires by the ratio of the
rear axle.
1. Obtain the tire speed by performing the tire speed calculation,described earlier in this section.
2. Determine the axle ratio using one of the following methods:
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Cross reference the axle information from the service information part label to the parts book.
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Cross reference the axle identification code that is stamped on the axle to the parts book.
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Perform the following calculation:
1. Make a mark on the tires and the propeller shaft.
2. Rotate the tires for one complete revolution, counting the number of propeller shaft rotations.
For example, the propeller shaft rotates approximately 31/2 times for every tire revolution. The axle ratio is 3.5:1
3. In order to find the propeller shaft rotation speed, multiply the tire speed by the rear axle ratio.
In the earlier example, at a 60 mph complaint speed:
12Hz x 3.5 = 42Hz
Match the frequency of the vibration from the EVA with the rotational speed of a component (either a tire or a wheel). If none of the frequencies match,
do one of the following actions:
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Recheck the data.
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Attempt to match the figures again, allowing for 1-5 mph of speedometer error.
When you have matched the speed of the component with the frequency of the vibration, refer to the service information that outlines the repair
procedures for that particular component.
