Join Date: Mar 2010
Location: Stockbridge, Mi.
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The 450 and 550 start out as a cab and chassis truck.
The frame is heavier/thicker, it's a straight rail type, flat frame behind the cab and only 34" wide (250/350 are 38") so to mount a pick-up box you need to add custom mounts. The main fuel tank is 40 gal and mounted behind the axle, so there is no place for a spare tire to go. There is also an optional 19 gal front tank (which my 450 has). Because of the narrower frame there is limited aftermarket available for exhaust systems that just bolt right on without some mods (mainly the tail pipe fitment because of the rear tank, also bolt on hitches have to be different for the narrow frame.
Like others have said the axles and brakes are heavy duty, and the wheels are 19.5" 10 bolt with F or G load range tires.
The '06 450 has a 16,000 GVWR and I think the 550 is 17,950 GVWR
Because my 450 has a pick-up box my insurance is the same as what my 350 was, but I was told by my insurance guy that he couldn't do that with a 550.
My 450 is perfect for what I use it for, hauling a slide in truck camper with a wet weight of 5000 lbs and pulling a cargo trailer behind it.
2006 F-450 XLT 4x4 Auto 4.30L Alcoa 19.5" 16,000 GVWR
Kelderman 4-Link/4-Bag Rear Suspension, Lariat Seats, '08 Console, '11 Mirrors, CTS, SCT X3
ARP's w/OEM HG, BPD 6ph FICM @ 58v, BPD Oil Cooler w/stat, Ported Intake, 185 amp Alt
P-Max w/WPE billet wheel, Spearco IC, 4" Banks Exhaust, Shell T6, Zerex EC-1, Oil bypass filter
Last edited by Arctic Fox; 06-30-2012 at 05:55 AM.