Since I deal in 64-72 Chev trucks that have the twin trailing arms on the rear.... I just learned about lowering blocks that you install between the arm and axle housing to get the drop you want while using the stock spring... Theres no geometry change to speak of so the computer in my brain accepts that idea...The coil over idea sounds like a good idea too...But..cutting the coils won't compute...Thanks to Uncle Bob the shorter wound spring idea is more clear.You don't sacrifice the ride so much this way.....AHUH.!!!....Al ......