I'm new to the site. Just put my radflo's on this last week. Read the post afterwards about the non-adjustable cam bolts on the 06's. I should have those by Mon. I have the coils that don't require UCA's. When I jack the truck off the ground and have the suspension at full droop I have contact on the coil buckets. I am under the impression that replacement coils are to help prevent this contact. I have the front set to about 2 1/4in. lift. Any thoughts?