Got some confirmation and gotta share.
The stock f350 coils I have are the .073 diam ones per the chart I'm going to send. They are WAY softer ride than the cc880s I have. I gained 1in over their height so on a diesel van swap they are a 3.5in lift coil. I didn't bottom out like I had with the cc880s so I think the linear vs progressive rate is helpful for that too.
The superduty stock .730 coils Ride like my stock twin beam suspension with the cc880s coils did vs the stock van coils.
The cc880s coils are just too stiff for the solid axle swap since it's not geometrically the same as the twin beam.
Black coils are hella cc880s rusted ones are stock f350 coils off my 2005 donor truck.
I've regained my sweet smooth ride again..and probably going to have to install the 1in rear lift block I kept..
Also found a long body 2005 stocker to get some comparison shots of. I'm a full mirror taller and headlight taller. So 5-6in.
Loving the ride..second camp trip this weekend!!!!
Top circle line is hella cc880 bottom of the circle is the cc880s rates n length compressed
Cliff notes
F350 coils 3.5 lift in van SUPER nice ride
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