Quote:

Shock rates and spring rates need to be matched. KYB's are good for maybe .92" A body bars.



Correct... the behavior of the system is determined by the dampening ratio, which is a function of spring rate and the shock rate. To maintain the same dynamic response the shock rate has to be increased to match the spring. If you increase the spring without increasing the shock rate the car will tend to be under damped and it will oscillate because the spring is overpowering the shock.

-Michael

Michael 1968 Barracuda Notchback Coupe 440 EFI 6-pack, T56 Magnum 6-spd