If I remember correctly, the Procomp stuff was 420/200 lb/in front front/rear. Or was the 180 lb/in the ProComp number?Shogunator said:To second the second hand info. I know for a fact that the Procomp spring rates are stiffer than factory. What the actual rates are, who knows. The ex has a procomp kit and it road rough compared to stock. Stock springs are not variable. If you are looking for cheap variables check out Aerostar (yes the ford minivan) rear coils. They maybe a bit too soft but they are tall (like 20") and variable. They worked ok in a sami but depending on what you are using them for they may work out (also depends largely on spring placement and weight) for you.
just my .02