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I am curious as to why to you want to go with a manual set-up. I have a '98 and will be installing a Posi-Lok cable ( hopefully later today) to replace the vacuum actuator on my front axle. It's not quite the same as manual locking hubs, but a similiar idea. If your truck has the vacuum actuator on the front axle, the Posi-Lok might be along the lines of what you are looking for. I thought Ford only used the vacuum set up on the Expedition in '97 & '98' models, but i could be wrong.