I put a RCD 6 inch lift in my truck and I have a slight vibration on takeoff. I also feel a vibration in my feet through the floors while doing highway speeds. I just had the drive shaft rebuilt with new u joints and a new carrier bearing. Also had it balanced. The shop told me it was a little bent but the were able to fix it and it balanced out. It seems a little better but I still have the vibration both on takeoff and at highway speeds. Now my guess is I'm gonna have to lower that carrier bearing bracket. Has anyone here ever done that before? It doesn't look like a simple spacers is gonna cut it since the carrier bearing sit on top of the cross member.