The journals of the universal joints are drilled and provided with lubrication fittings through which lubricant travels to all four oil reservoirs, through a small hole inside of each reservoir, direct to the needle bearings. The seals protect the needle bearings against lubricant leakage, dirt and debris.

1. Lubricate with chassis lubricant.



2. When greasing the joint, ensure that a flow of grease at all four trunnion seals (1) is visible in order to ensure the lubrication of the joint.
3. If grease does not appear at all four trunnion seals (1), rotate the universal joint trunnion in all four directions while applying the lubricant under pressure in order to relieve any air lock inside of the joint. Air lock would prevent the lubricant from reaching the bearing area.
4. Loosen the cap bolts and cap enough in order to allow a flow of grease, as necessary.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Install and tighten the bolts.

Tighten
Tighten the bolts to 71 N·m (52 lb ft).

1. Splines of the slip joint are lubricated through a lubricant fitting installed in the slip yoke. Apply grease gun pressure to the lubrication fitting until the lubricant GM P/N 1051344 appears at the pressure relief hole.



2. Cover the pressure relief hole (2).
3. Apply pressure until the grease appears at the sleeve yoke seal.
4. Lubricate the universal joints and slip yoke splines at the specified periods. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.

This bearing is permanently lubricated and no attempt should be made in order to add or change grease within the bearing.

When installing a new center bearing, fill the entire cavity with chassis GM P/N 1051344 grease. Ensure that the quantity is sufficient enough in order to fill the cavity to the extreme edge of the slinger surrounding the bearing.This will shield the bearing from water and contaminants.