I have a 2004.5 silverado crew cab that I am interested in swapping out to the navigation screen. My truck does not have bose or on-star. I do not know much about the newer model trucks, but I know that some of the old ones had a factory amp and some were built into the radio. Can any one plese tell me if the swap is possible in my truck, I am not interested in changing out factory amplifiers. Any help would be awesome thanks...Ryan