Awesome thanks. What you have is basically what I am looking for. Nothing fancy, 2 speakers is all I need. BTW sweet truck, its hard not to like the old Heavy Chevys..Sorry, I thought it was RetroFit but it's actually RetroSound. Check out JC Whitney (link below)--that's where I got mine. They should have one for a 77, not positive though. I really like mine, although I wouldn't consider myself a sound system guru. It plays my tunes and does hands-free calling for me. Only downside: the directions aren't very good on installing and setting the options. For example, setting the clock is entirely too complicated. Setting the clock was more difficult than installing the dang thing. Other than that, no complaints. I zip-tied two small speakers up under my dash...they work great!