someotherguy
+1y
Also keep in mind what length shocks you use will depend on how you drop, not just how much. For example say you do a 3" spindle drop on a squarebody Chevy, you still run stock shocks, nothing changed except position of the stub axle on the spindle.
Dunno about Fords at all but if you post more details someone here knows Fords will probably help.
Richard