Hello-
I suggest getting the factory service manuals. The Haynes manual is good, but the service manuals are absolutely comprehensive.
They come in 5 volumes, and all together are about as thick as 3 phonebooks. They cover all trucks ford made for that year, so there is a lot of extraneous stuff to dig through, but they're worth the effort.
I love mine.
I got mine from Faxon Automotive Literature - 1800 458 2734. Should run you around $80.
For anyone doing a google search: Ford Factory Service Manuals can be purchased from Faxon Automotive Literature.