Alright, first of all my name is Lucas and I drive a 07 Silverado. I bought my truck with an extended warranty but I really want to modify my truck's suspension with a lift or even just a leveling kit. I called a local GM deaer asking if it will void my warranty but the person on phone didn't help much. I was wondering if anyone has been in the same sistuation and can help me out here. I'm sure the answer is simple and will be once I change something it will void the warranty but is there anything I can do? I figured as long as I take the truck to a certified GM service center and have them install it the warranty should be ok still? Thanx guys and please get back to me.