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No doubt in my mind.
My best mod was slowing down the engine at any given road speed through re-gearing. Done in two stages. First 3.08:1 rear axle gear, then a GV overdrive. Good for a 20% improvement by itself and also make it easier to realize aero road load reductions.
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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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