Got any pictures of it you can post. As Mike mentioned a 3500 series, is something I've never seen info., or literature on. I'm curious as to what you really have ? 1953 U.S. built trucks, in cab, and chassis form had series designations as follows, 3100, 3600, 3800, 4100, 4400, 5100, 5400, 5700, 6100, 6400, & 6500.