Wiz....better check the Ford website, the Twin I Beam front end is still in use under the Econoline....read the specs for yourself man. If Twin I Beam died....someone better call Ford and let them know..... Also, Twin I Beam was in use in F series up until 1996 before the big redesign.
http://www.fordvehicles.com/trucks/eseries/features/specs/
Ford needs to bring Econoline into the 21st century....the full length body doesn't help much when you get into cutaway chassis sales... (AKA ambulances, U-Haul trucks, etc, etc)...come up with a better argument than that friend.