You should easily find 3.55 gears. Maybe 3.31s are available.
That torque monster engine will turn any gears you put in it.
Really good MPG also entails aero cleanup. Start with a tonneau. They help a bunch.
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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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