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just saying when u get to a 450 the chevy to compare is the 4500 they share similarities in drive axles I believe both have a dana70 front and dana 80 rear with comparable brake sizes and axle...

well really that ford should be compared to one of these

http://image.trucktrend.com/f/8563185+w750+st0/163_0708_13z+2007_gmc_c4500_4x4_crew_cab_topKick+front_view.jpg

its the 6.0's that were an international abortion .... the 7.3's were killer for power in the 90's