I don't really have an answer to more travel without some kind of lift, there just isn't any space.
Look at the diameter of a D60 axle and then look at the depth of a D44 or 50 beam...
And if you add height at the wheel you need drop pivots to keep the geometry close enough to stock that you can get it in spec with offset bushings.
It's a catch 22.
I mean, I understand Ford's desire for 4wd IFS, but the execution is bass akwards.
It is a book smart solution to keeping costs down, but it's so hobbled by its own design it's a liability in the real world.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.