Warranty should cover the u-joint. It's only a matter of time and the joint will seize. My 1st joint went at 16K, and no, they are not greasable.I went through and jacked up the truck, checked the play in both front tires, realyl overlooked everything. I coulddn't find anythign wrong with the front end. So I had my dad get in the truck and slowly drive it back and forth in the driveway. Come to find out the noise came from the rear universal joint. Now does anyone know if this would be covered under warranty? Or is there a grease fitting on these? There is no harm in driving it like it is except for its frickin annoying as hell.