Going with 38's, I'd recommend 4.56 gears. In fact, 4.56 with 38's would give you the same RPM/MPH as 3.73 gears with the stock 31's. Until you can regear though, the truck is going to feel like like an absolute slug.
In the mean time, you can adjust the tire size and gear ratio using the custom options.
Take care.
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Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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