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Model	Years	Speeds	Drive Train	Trans Model

F-450, 550 Super Duty (3/98-04)	1998-04	4 Spd	7.3L Diesel, 6.8L	4R100
F-450, 550 Super Duty	2003-04	5 Spd	6.0L Diesel	5R110W
F-450, 550 Super Duty	2005-08	5 Spd	6.8L, 6.0L Diesel	5R110W