SuperStock spring tips.

actually shimming the front hanger does nothing for spring pre-load , the rear shackle is still a double pivot point so all shimming does is move the rear end back changing the rear angle shackle slightly and more importantly for launch -thrust angle , I just went through this with my car , the longitudinal wheel base was almost 1 inch shorter on the passenger side and the thrust angle was way out when we stringed the car , I added @7/16 to the passenger side bringing it within the 1/2 inch they speak about when using SS springs , remember the passenger spring at rest is taller so it pulls the rear end forward until torque loading evens the ride height which moves the rear end backwards in proportion to the compression on the spring .Ain't Geometry and Physics Cool ?