BlackKnight
Full Access Member
Better get cal-tracs if you get the x-metal drop. I've had many vibration issues no matter what pinion angle it was set to. I had the shop put on the new shackles that came with the drop kit and half of the vibration is gone now; gotta be a weight transfer issue with the 06 QCs. The cal-tracs should totally eliminate the vibration (I hope) even though the kit should work correctly without additional hardware. Good luck