[cdb95z28]

Just some advice on adding drop springs.

Putting on drop springs and getting an alignment is not enough. Any rubber bushing on the control arms and anti roll bar mounts will need reset or "timed". You must loosen the fastener at the bushing, so much that the arm/bushing has lateral play in it. Then retighten. Be aware that many Gen6 suspension fasteners are torque to yield (TTY) one time use bolts. GM calls for them to be replaced any time they are loosened. GM also calls for timing of rubber bushings in the service manual.

This procedure times the bushing to be in a neutral state at your final static ride height. Any rubber bushing that is not in a neutral state will have bind in it and could cause additional wheel rate (stiffness). Bound bushings could also not allow the car to lower as much as it could.

The anti roll bar mounts are a rubber mount that are tightly bound to the bar. Any unintended bind at these bushings will create anti roll bar preload (stiffness)that is not desirable. To time these bushings is a little more work because you cannot merely loosen the mounting bracket fasteners and expect the bar to move to a neutral state. You must remove the rubber bushing from the bar, lube the inside of the bushing with liquid soap, reinstall and tighten the brackets (at static ride height) while the soap is still slippery so the bar finds the neutral state. Eventually the liquid soap dries up and the rubber once again grips the bar super tight at the required spot.

I believe that a lack of bushing timing is the reason some say the ride got harsher and sometimes the car feels bouncy.