I am new to this site so I hope I have this in the right form. Could anyone please tell me where I might find a frame diagram w/dimensions for a 1957 F100? I am planning on building a 4X2 tube frame for an IFS and 4 bar rear. Thanks.

 

A Ford Shop Manual available in "PARTS SHOP" on this site will provide you with basic dimensions for length, width, drop, spring spacing, etc.

 

The shop manual doesn't have enough info to build a frame from; what's wrong with measuring the frame you have (or one in a junkyard)? If you're building a frame from scratch, all you really care about are where the body mounts are and centering the wheels in the fenders.

Or assemble the body parts on a flat surface and drop a plumbline through the mounting holes and mark the locations on the floor and measure.