I believe the core of the issue is that there are unknown factors, mods, "gerry rigged" matters this person is dealing with. Until he CONFIRMS the proper axle, frame and suspension geometry as within tolerance and specifications, can one make a true and factual asseretation that the springs are incorrect.
From what I read, he has a 67 Firebird, non staggered shocks. Now he has 5 leaf springs.
67 was mono springs with non staggered shocks and pinion snubbers.
I am certain that if a competent, knowedgable tech was to assess the issue, that there will be significant misapplications of a 5 leaf system without the proper perches, pads, hardware. Just a guess, but without seeing the parts list, axle, perches, shoch setup, all one can do is shoot a shot glass in the dark.
That is whay there are service manuals and such.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
