Will 3/4 ton or 1 ton leaf springs bolt up to a 1/2 ton frame? Thanks:ro)

I think the front springs will interchange. There are different length springs for the rears on some 3/4 and 1 tons. Download the Rancho application guide and footnote pages and you can cross reference them. The 40054s springs lift a 1 ton 2 1/2" and a 1/2 ton or Blazer 4".

Front springs are interchangeable, rear springs are 52 inches center to center. 3/4 ton's prior to 78 used 52 inch springs in the rear. After that they went to 56 inch springs.