I lowered my truck 3" in front and 6" in back. In addition I went to smaller tires up front to get another inch.
My truck went from 76" tall to 72" tall and I gained 1.0 MPG.
The truck also corners much better.
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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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