The numerically lowest gears he could get for his front axle would be 3.55s. It would be cheaper and more effective to convert to a T-56 manual. OD = 0.5:1.
There are kits out there for converting GM vehicles.
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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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