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I do not have the answer to your question but let me welcome you to FTE, the best Ford truck forum on the world wide web! There are several guys here that have Big Jobs that can help you. Also, p!ease post some pics of your truck.
And if your title is more descriptive you might get more lookers and an answer.
Welcome to FTE.
Let me see if I have this correct. You want to change the rear axle gear ratio on your F-800 to 4.56:1. I must ask what size tires you have. Is this some kind of hotrod?
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.