a couple weeks or so after you drove mine i had to order a guibo. that took a week. so by the time i got it replaced it was 4 weeks of daily driving and it got pretty bad. so bad that my mechanic had to custom weld the end of my drive shaft because it beat the hell out of the drive shaft flange. so where as you may have a different problem i just wanted to let you know how bad mine was. one way i figured that the vibration was solely from that was if i was driving at any speed i put it in neutral to stop drive shaft movement and the vibe stopped.