Mopar 5102157AE Universal Joint Kit

If any of these conditions exist, it is recommended to replace the universal joints with new ones.

Universal joints consist of a yoke on each side connected by a crosspiece, known as a trunnion. Cups at each end of the trunnion contain needle bearings which provide a smooth transfer of the torque load, and snap-rings, either inside or outside of the bearing cups, hold the assembly together.

Use a small pair of pliers.

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.