Kia KK15032850 Joint-Steering

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Universal joints are mechanical couplings that connect two rotating components that meet each other at different angles, composed of a yoke on each side connected by a crosspiece called a trunnion with needle bearings in cups at each end of the trunnion held together by snap-rings. Wear in the needle roller bearings is characterized by vibration in the driveline, noise during acceleration, and in extreme cases of lack of lubrication, metallic squeaking, and ultimately grating and shrieking sounds as the bearings disintegrate. To check for wear, try to turn the shaft with one hand while the other hand holds the rear axle flange or front half coupling, use a pry bar inserted into the gap between the universal joint and the driveshaft or flange, or attempt to lift the shaft and note any movement between the yokes of the joints. If any of these conditions exist, replace the universal joints with new ones.

Using pliers, remove the snap-rings from the spider and place the driveshaft in a vise or press. Place a piece of pipe or a large socket over one of the bearing caps and use the vise or press to force the bearing cap out. Transfer the sockets to the opposite sides and press the other bearing cap out. Pack the new joints with grease and position the spider into the yoke. Partially install one bearing cap in the yoke and start the spider into the bearing cap. Partially install the other bearing cap and press the bearing caps into place. Use the smaller socket to press the caps fully into place and install the snap-rings. If the universal joint has a grease fitting, install it and add grease using a grease gun. Finally, install the driveshaft.