WILL NOT BUY AGAIN - I made a mistake buying these to save money instead of other well known brands like Rancho, Bilstein etc. I bought them and installed them 7 days ago. Installation was easy and straight forward, perfect fit for my Chevy Z71 4x4 truck. Their performance is very poor, not a smooth ride. In fact, my truck shakes every time I drive over a small speed bump or railroad track. It is clear that all this is not good. New dampers should prevent that. I can't even imagine what will happen if I go off-road. I know they're brand new but I'm going to spend some extra money this weekend and replace them with a reputable brand.