I gave them 2 inches clearance, but that was just enough to occasionally drag. They eventuallt tore off the clamp at the front wheel. They were made of 3/8" ripstop conveyor belt. They helped about a quarter of one MPG.
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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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