My '83 grand marquis sedan has had a spring sag for a while, left side is noticably further down than the right of the car. Also, the back hangs down more than the front. I've thought about replacing the springs. Does anyone know of any particularly good brands/types of springs that would be good? I hear things about Constant rate and variable rate springs, and I'm pretty sure I know what that means as far as a spring goes.... but what effects will either have on the way the vehicle rides and such?
Thanks,
Nic