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Lowering a 4x4 probably is not in the cards.
My recommendations:
Get a flat tonneau cover. Hard or soft. Both work.
Get some low rolling resistance tires. Goodrich Long Trails are excellent in that size. air them up to the sidewall max. I overinflate by 25% but that's for me.
Covering the cab/bed gap is good. Covering the wheel wells, even partially is better.
Towing a heavy load with an automatic probably forecloses any gearing benefits.
Slow down. Drive the limit and no more.
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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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