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My air dam was massive and made of very tough rip-stop conveyor belting. I was very aggressive, allowing only 1.5 inches ground clearance on both the front air dam and side skirts.
The combo was worth an extra 0.75 MPG (3%).
But they did drag more than I liked. Maybe a little more clearnce...
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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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