We had the 6-inch kit installed at the Burbank, California, 4 Wheel Parts Wholesalers outlet. In addition to the springs, blocks, and U-bolts included in the kit, you’ll need a steering correction of some sort. A Pro Comp 4-inch-raised steering arm was chosen for this truck. With any lift and steering correction, the drag link will need to be adjusted to make the left and right turning radius equal. On 1970s GM trucks, Jarve says to adjust the drag link until the pitman arm is 90 degrees to the framerail with the tires pointing straight forward.