Due to the panhard bar stud, self adjusting brakes and 12 bolt, it is probably 1964-1966(-1972). Believe 64 was first year for 12 bolt and possibly self adjust. I believe 12 bolt corporate was 1964-1982. I don't think that style panhard bar on stud/control arms went past 72. A panhard would have been 2WD and have coil springs and, after 66, have 5 lugs. If from a 4x4 leaf spring truck, it would have spring over axle and no panhard stud...so a lot of work has been done to modify something for your truck. Is that clear enough?
