update. i found out where the vibration was coming from. I got in my truck and i drove around the block thinking to my self what the hell could be causeing that and then it hit me. well not really, it reveild its self. I was almost back home and i heard a loud clunk. pulled over and there was my rear drive shaft laying in the middle of the road. WTF. :wall: oh well it looks like im going to the auto parts store tomorrow. :bluecry: