I have a '95 2500, 2WD with the 2-piece driveshaft. I had the center support bearing replaced about 130,000 miles ago. I wish I could grease the darn thing, but so far it has resisted all my attempts to grease it. It's not noisy yet, and there's no play in it, but I'd sure like to grease it. Has anyone had any luck getting grease in that bearing?

No such luck! I've thought about drilling into the bottom of the race to poke some lithium in there, but I don't think it will help much. Plus too much grease will just wear the bearing out faster anyhow.