WOW! That’s way more spring than axle!
You have basically the same truck and tires as the OP. Maybe share your tire pressures when running around bobtail.
So the photo above is of my 79, that has not been driven yet. So I cannot speak to how it rides. But the springs are "Blueprinted" from what originals were, 79 Big 10, 6200lb GVWR, 56" springs. Had them made at a local spring shop, they pulled the information from their vintage books.
But if I step in the bed I can flex them, or wiggle the truck. So I don't believe it is going to be a total log wagon.
Here is a photo of the original 79 springs with overloads, there is/was wear on the rubber bumpers that I believe it was loaded enough to use the overloads on multiple occasions.
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Now my 76 is a non F44 (non big ten truck), 5400lb GVWR, 52" springs. Best photo I could find that you can see the springs. 6 leafs I think?
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But I have put about 60k miles on the 76, I've always thought it rode fine, never any complaints from others. There has been a 30 gallon engine drive compressor living in the bed for 4 or 5 years now, so that certainly would help. Even before the compressor I never thought of it as a log wagon.
I don't remember what I have for tire pressures, but it's probably 35-40psi all around on the 31s.
With the 235/75/15s before it was what the door chart says, 28 maybe?
Maybe I just have low expectations or high tolerance to ride quality... I think it (and the Cummins, and dart) rides better than a lot of new cars do, if says something.