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Unless you raid the axle off an older Cadillac Fleetwood, even 3.08s are hard to find. The aftermarket no longer supplies the 3.08 set I have.
Bigger diameter tires will hurt you mileage. Stick with the OEM size tires. Sizing tires is one thing the OEMs do well.
I have talked to hundreds of truck guys and the story is always the same.
Bigger diameter = lower MPG.
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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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