I notice that these rates don't quite match the Firm Feel advertised rates.
http://www.firmfeel.com/b_body_mopar_torsion_bars.htmlMy guess is that Firm Feels lower control arm measurement is about half an inch longer. Perhaps they measured all the way to the end of the lower control arm, instead of stopping in the middle of the ball joint mounting hole?
This illustrates why it would be a good idea to calculate the rates if you're comparing torsion bars from different vendors. How they measure things can affect their advertised wheel rate.
FOR THOSE OF YOU WHO ARE MORE EXPERIENCED, IS MEASURING TO THE END OF LOWER CONTROL ARM, INSTEAD OF TO THE CENTER OF THE BALL JOINT MOUNTING HOLE A BETTER METHOD?