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Normally a 4wd F150 has radius arm front suspension, but it being a SC 4wd F150 it should have a leaf spring front suspension. Correct? Since you got the refab box from a generally better parts source, the chances of it being a better quality rebuild are at least... better. BUT NOT always. Is the shimmy just seen in the wheels of felt in the steering wheel?
I am still thinking about what or where the original problem can come from.....Does the new steering shaft you put in have a u joint or a flex joint connection? Is it a Borgeson shaft with the steering damper built in?
I think the problem started with it is a manual steering gear box (Armstrong steering) the shaft gets worn because even with the gearing in a manual steering box it still puts a great deal of stress on the shaft and in the wear areas it gets ridiculously loose. The only solution for me was to weld around the wear areas on the shaft to replace the missing material from the wear and turn it down on a lathe to specs.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.