Quote: Originally Posted by BC RACING
evo 77- your absolutely right. It's hard to explain in words. That's why I didn't say your wrong, just wanted to help clarify. But I did a quick pic that may help visually explain.
There are two points in which lock the shock body. You have the upper and lower. The upper consist of the spring seat and lock ring and the lower is the lower mount body and lock ring. When you loosen the lower lock ring this allows to raise or lower the vehicle without affecting the spring preload (as long as they are tight). The shock body will rotate with the springs as you do your adjustments. Same goes for the uppers. If you have the lower ring locked and you loosen the upper ring from the spring seat then you can adjust preload. Below is the picture of a similar application. If we can help with any questions let us know.
This was taken from another thread but it should help those asking about pre-load and adj. of the coilovers.
Also taken from the thread is that the BC's pre-load is set right out of the box but if you feel the need for adj.
you should set them no more than 5mm pre-load. -stated by BC[/quote]
