Thanks, Liventre, for bringing this to our attention.
The person to contact at Grand Prairie Ford is Dann Munro (email
DMunro@vtaig.com). I sent email to Dann inviting him to join the ExPo forums.
There's an ad on eBay advertising an F554 conversion. Price $96,800. The ad says that Grand Prairie Ford has built 27 of the F554 models.
http://cgi.ebay.com/ebaymotors/F554...ls-4x4-Severe-Duty-Applications-/300722886217
The ad for the F554 package says
2012 F550 4x4, 165 inch wheelbase shown
available in any color and body style
6.7L Ford V8 diesel, 6 speed auto trans
Electronic shift on the fly transfer case
Dana 80 front, Dana 130 rear axle
axles rated for 22,500 lb (up from 19.5K in 2012 F550)
20x10 inch aluminum 3 piece wheels
internal beadlocks with run-flat inserts
365/80 R20 Goodyear tires, 44 inches tall
central tire inflation system
Planetary double caliper brakes on front axle
Planetary parking brake
no mention of re-gearing the axles to match the 44 inch tall tires