Looks to be a 1951 year model, & is either a 450 series 3 ton, or 470 series 3 1/2 ton. Should have a 270ci. GMC 6 cylinder engine in it. If it hasn't been removed, there should be a "GMC Service Parts Identification" tag, on the back of the glove box lid, with all of the trucks info. on it. Such as, engine size, type transmission, type axles, type brakes, etc. Looks good. Where was it located ?
