I've got an inconsistant vibration at around 60+ mph. Then when I let off the gas it gets worse. If I put it in neutral it doesn't go away. Then if give it gas again it gets better. Then sometimes when I take off and climb to 75 it doesn't vib at all until I hit a bump or let off the gas. I replaced the u-joints a while back, have no lift, stock tires. But on the rear u-joint the ears are a little worn and I can grab the drive shaft and push it up and down. Does this sound like the culpret????? Don't you buy no ugly truck!