I want to get all of the planing covered. The 6" lift kit will have blocks in the rear. I want the springs from the factory. I put add a leaf on a 3/4 ton truck with a lift kit and the ride was bad! Traction Bars are to eliminate axle wrap due to the rear blocks. Stainless Steel Brake Lines front and rear. I did a 1998 F250 and I was not impressed with the results so I want to get it right on my F350.