School me on '60-66 half-ton suspension

[bob_o]

I know some of these trucks had torsion bars up front for a few years, I've heard some had coils and trailing arms out back... Which years had what? Were certain setups optional for certain years? I'm looking into buying a '60-'66 Chevy/GMC half ton and I'm curious about what was available and when, suspension wise. Ideally, I'd like to find a truck that came with coils at all four corners to make lowering it that much simpler. A long shot, I'm sure. Just trying to educate myself. Thanks in advance!

Bob