I have a 2008 F150 FX4 Offroad that I recently have a 6 inch Fabtech suspension lift put on. It's a dream when driving it in 2WD anywhere, but when 4WD is needed it shakes and makes an extremely loud noise from the drivers side front. I know this is because of the suspension lift but I am unsure of how to go about fixing the problem. I have been to a driveline shop to see if they could add weights to balance me back out and they said "yea we can do that, but we think you are going to need a whole new driveshaft built". They took a measurement of the driveline still installed but requested that I take it out at home to get the measurement and bring back to them. I don't mind all of this if it fixes the issue. I just want the vibration and noise to go away. With myself not knowing much about drivelines, I was hoping someone out there may of had the same issue and could shed some light on the steps I should take. Thanks.

 

I am running a 8" lift with no front drive shaft problems. Bring it back to your shop who installed it. Sounds like cv problem.