Spring Change/Shock Adjustment
Just finished installing 350# - 8" Hypercoil Springs in the rear. In the front I installed 400# - 9" provided by Pro Shock through Unique (chrome plated).
Since I have Billstein Racing shocks I can change the Nitrogen Pre Load with a schrader valve. I am running 150 PSI in the rear shocks and 175 PSI in the front shocks. I have a high pressure inert gas regulator and tank for the nitrogen and a Billstein fill tool. While I was at it I deflated all tires and filled back with pure nitrogen. After getting the ride height set I did a test run up I-65 Saturday evening and back (40 miles total) running 65 - 85 MPH, then a few side roads and I like the combination. Good solid ride but not to harsh, really smooth at 75-85 MPH. I think you could up to 450 - 500# with a 9" spring. With the Pro Shock and it's design a 10" front spring will probably work well (they are black, powdercoated). With the 10" spring 400 - 450# should work real good.