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New to this, so I need an education. I have an '88 F250. Overall the truck is great shape, but underneath there is rust on the floor pans out against the rocker panel. I don't understand what I'm looking at in order to get replacement parts. There is a flange turned downward that is spot welded against the body and the rust is through this panel. Do I need an outer floor pan replacement? Inner Rocker panel? I don't know how the truck body is put together here, so I don't know what I need. As I understand it, you see the rocker panel from outside the truck, so does the assembly go like this; rocker panel--->inner rocker panel--->floor pan? Can someone explain this to me please?
Hard for me to picture what you're describing however if you can locate a Mitchell Collision Guide for your year vehicle it will show individual pieces used in constructing your cab.
A body shop specializing in older vehicles would most likely have such a thing--they might let you thumb through it without cost.