[hoover]

My air dam is 5 and one half inches from the pavement. Only difference is on my 2004 Silverado the air dam extends almost straight down from the front face of the bumper. I used 3/16" black abs plastic, screwed it directly into the bumper directly below the top plastic bumper cap. I have a 2" abs plastic pipe behind it about 3" above the bottom of the air dam for support. Two eyebolts into the pipe hang from my snow plow mounts. Last year put about 5,000 miles on this setup, scraped 3 times on entering odd shaped driveways.