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A while back I did this on my truck. Instead of coroplast, I used 3/8" ripstop rubber conveyor belting. Made both an air dam and side skirts. With the conveyor belting i didn't have to sweat road debris but the side skirts made jacking the truck up for service a royal pain, so i ttok them off. the loss of MPG was minimal.
I did modify my air dam to be 6" above grade, but it's still there.
Attach the front edge of the side skirt REALLY well.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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