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I though I remember hearing some looking for actual spring rate of the rear torsion bars.

I can't find the old post, but I did find the relationship

It was on Paragon's Tech Session

Here is link
<a href="http://www.tech-session.com/Paragon/Info/944_tbar_rate_comparison.htm" target="_blank">Paragon - Torsion Bar & Helper Spring Wheel Rate Guide</a>

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