[Roger V]

This is a copy of my sub-post to this subject on the fordbarn last November"

Most (maybe all) spring manufacturers do not make the front spring to spec. Eaton Detroit Spring makes springs for most makes of cars. Years ago I talked to them and they had a copy of the original print. It called for three different thicknesses for the leaves. They make them with all leaves the same thickness. Eaton Detroit said the sales volume was too low for them to stock the minimum quantity of the three thicknesses.

A friend who was a Ford truck suspension engineering supervisor used Eaton Detroit for prototype springs. He was able to get them to make two front Model A springs to spec. They had to machine the steel they stocked to the "other" thicknesses. Needless to say the cost was exorbitant! He got one and I got the other. Load and rate vary a lot when not to spec. Most would likely not know it because something new is better than a fatigued existing one.