The driveshaft is sometimes called a "propeller shaft". There are very few
problems relating to the driveshaft itself. The Mazda factory service
manual warns of balancing washers on the bolts that secure the driveshaft to the
pinion flange going into the rear diff, but we've never see such washers.
The driveshafts are balanced themselves; you'll see "patches" of metal welded on
various areas along the main shaft. This would eliminate the need to
balance the driveshaft externally.
Typically, U-joints go bad that produce rythmic noises which increase with vehicle
speed. If these noises are coming directly under the car, it could be a failing
U-joint. The driveshaft can be removed, and the U-joints easily inspected
FC3S Pro: Problems, Components - Driveshaft, Universal Joints
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