How to grease a truck. Uni Joints. Before you grease them you need to check them for wear. Push it, Pull it, twist it. Look and feel for any movement. On a good universal joint there should be pretty much no movement. Also check your center bearing for movement. A little bit is okay. Check uni joints before you grease them because the grease can take up some of the movement.
To grease a uni joint properly, grease must come out all four caps. Follow the driveline along and grease all uni joints. Don’t forget about the driveshaft between the two back axles. Don’t forget to grease the slip joint splines.
What do you do if you can’t get grease out all four caps? Remove the lock tabs and bolts. Hit the driveshaft to pop the cap out. Make sure you only hit the spots with the yellow marks.
Pump grease into it. Now with the cap removed slightly if you still cant get grease out the cap you have two choices. You either put it back together and without grease in that cap it will wear out quicker. Or you can fully remove the Uni joint and investigate.
Reassemble by hitting the cap back in. Removing the grease nipple allows an easy passage for the grease to flow when you push the cap back in. Hit the cap back in, apply Loctite to the bolts and torque them. Bend the lock tabs back in place
Spicers video on greasing universal joints