Well I just recently put on a 2.5 in coil spacer lift. I am really happy with it, and it has just started to break in, and I love the new ride, but now...i think i want a little more. It's gotten a chance to settle, and I'm a very anal person, so I notice the difference in height from the day before I got the lift installed, to the day it was finished, to now. I know I'm just really meticulous, but I was looking into replacing my springs anyway (they've got 140k on em and I;ve got the saggy rear). I was just wondering if it would be safe to replace them with the Performance Product's 1in. lift springs in addition to the coil spacer lift, and what problem's i could potentially run into. or if it's just a better idea to replace them with new stock springs, since that will cure my sagging rear anyway. Any input would be greatly appreciated.