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I wanted to post this so ya'll might benefit from my experience. I used 5" CPP drop springs on my '65 C10 SWB Stepside. The ride was like a big ole Buick and the springs were so light weight that hauling anything of significant weight in my truck wasn't possible.
So I replaced the rear springs with CPP 4" drop Heavy Duty Springs. Much better ride and since they are heavy duty I can now haul more than just a couple hundred pounds of stuff
The new springs look very similar to the OEM springs that were originally on the truck, just a couple less coils and shorter overall height.

4" Heavy Duty Drop Springs are on the left, CPP P/N 603-4HD, 5" Drop Springs are on the right, CPP P/N 603-5

So I replaced the rear springs with CPP 4" drop Heavy Duty Springs. Much better ride and since they are heavy duty I can now haul more than just a couple hundred pounds of stuff

4" Heavy Duty Drop Springs are on the left, CPP P/N 603-4HD, 5" Drop Springs are on the right, CPP P/N 603-5
