Mopar 68206321AB U-Joint

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One can try to turn the shaft with one hand while holding the rear axle flange or the front half coupling. Any movement between the driveshaft and the front half couplings, and around the rear half couplings, indicates considerable wear. Another method is to use a pry bar inserted into the gap between the universal joint and the driveshaft or flange. Leaving the vehicle in gear and trying to pry the joint both radially and axially can reveal any looseness. A final test for wear is to attempt to lift the shaft and note any movement between the yokes of the joints.

Wear in the needle roller bearings can be identified by vibration in the drive line, noise during acceleration, and in extreme cases of lack of lubrication, metallic squeaking and ultimately grating and shrieking sounds as the bearings disintegrate.

The dust seals.

A workbench equipped with a vise.