OK, just wondering if anyone has verified what the above RPO code translates to or if anyone has that code and has verified what ratio it is??? I looked at a 1980 C20 that lists that on the sticker in the glove box. Before I go back there to test drive it I'd sure like to know what it is if possible... 5.7L/SM465 combo if it matters... Just a plain truck, no AC, just warning lamps instead of gauges. What impressed me was that the body is real clean for a work truck. The drawback for me is it has a utility box on back...