I spent last night reading whatever I could find on this. So far from what I got, the GMT800 1 ton trucks will work.
4.6 equipped f150s and expeditions will have the shorter bars. 5.4 will have the longer bars except for the supercrews which will have the shorter bars
The spring code for the F250LD/7700 bars is "7".
And now that we know they're all interchangeable, I am curious as hell about using these:
http://realiftsusp.com
I was looking at those as well. I still am unsure how they work? There is very limited information on their site other than they are on some rigs. I also emailed the emails with no response. They do look interesting.