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General rust checks and protection. Maybe drop the tank shield and hitch, clean and coat them and the frame areas around them. Hell, if I had my frame accessible like that, I'd love to media blast and paint what I could.
Check over all the body mounts, just makes sense to replace them while the body is off anyway. If you don't have exhaust, now would be a great time to throw one on as well.
As already mentioned, checking for any rust and addressing it now would be ideal. Personally, even though you're in AZ, I would use the opportunity to POR-15 or similar the entire underbody and possibly the frame to have peace of mind and extra insurance down the road against unwanted metal mutation from rust.
It will never be easier to do headers and Y pipe than right now.
Not only that but the heads will be off the block for any broken stud work. Ideal!
I would go crazy (and broke) cleaning and detailing that frame in this situation! New brake lines, body mounts, and.....and....and....
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.
