There was nothing in the archives on actual spring rates. Even my Mopar chassis manual is very vague, saying 'production spring rates were from 80-130lbs. So that '130lb' spring is either a hemi XHD spring, or a wagon spring. A .92" hemi torsion bar is rated at 115lbs, for what thats worth.

I'm going to put a set ov nice original 69 B-body wagon leafs in my 3200lb Challenger and i need to buy new T-bars for the front to match. I'd assume that wagon springs are at least as stiff as hemi springs, and a hemi T-bar is .92". But are they stiffer? Should i buy 1" bars?