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 weights...same with the f550 where its a dana 70hd front and a dana 135 rear, same axles are found in the 5500 chevy.

The f650 you pictured would be compared to a 6500 chevy and on and on.

the 450 to 4500 comparison is probably the best since both use the engine options from the light duty pickup counterparts in a medium duty chassis... the f550 and chevy 5500 open a can of worms because both offer a miriad of other powerplants.....


and the shields...those are there to funnel fords to the side of the road when shut down going up a grade infront of you