Hey guys, first off, great forum. I recently bought a 2001 crew cab long bed with 254k miles. When i looked it over, it needed a driveshaft support bearing. Once i replaced it i noticed a slight humming/vibration kind of like what you would hear from a rear bearing in a front wheel drive car. It only happens between 50-65mph, and it gets louder when you hit bumps. I have crawled under it and found the ujoints to be tight, the carrier bearing to be tight, pinion to be tight. At the transfer case i can push the yoke up about a 1/4" and there is a slight clunk inside the case. I have looked and looked for an answer online and cant really find a good answer. kind of sounds like output shaft bearing, but i have seen a few things saying bushing, can anyone shed any light on the situation?