A three inch "slam" is a good practical mod. S10s sit kinda high and lowering ride height will help about 4%.
I lowered my truck 4" up front and 6" in back and realized a 1 MPG improvment.
Be sure and re-align your front end after a slam.
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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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