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1. YES
2. Yes. It will sit slightly lower due to smaller tires. To lower if you must do something about those HD springs.
3. It should fit but will require different u bolts since the front springs are wider. Steering linkage may bolt up.
The F1 axle and its steering components can be used. Fewer front leaves would be necessary to lower it. The steering would need some attention, as the stud ball for the F6 is larger than the F1, ... so if you PM me, I can send you some photos of the setup that actually can work. I'm using an F6 steering box in my F1, and have the pitman arm deal worked out so the F1 setup is compatible with it.
Rezvani's Latest Post-Apocalyptic 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.