Big Block Torsion Bar Selection

Here's a chart showing the mopar spec bars. Keep in mind that the rates of aftermarket bars may not be exactly the same for the same diameter, since the spring rate does vary with the metallurgy of the bar.

/6 bars are only .83" and only have a 90 lb/in rate. By comparison, the 1.14" bars have a 350 lb/in rate. The 1.12's from Firm Feel that I run have a 300 lb/in rate. I wouldn't run them with KYB's, but they're awesome with Bilsteins.