So is it a 270 or 370 engine? GMC used both or are you talking about the series of truck. If so it would be a 370 series would be a 2 1/2 ton. It uses the same cab as pickups unless it is a low cab forward model. These can be identified by a cutout in the door for the fender. Engines are interchangeable from 100 to 400 series without modifications. Front sheet metal.. hood, grille, fenders of all 300 series are interchangeable. I think a 400 series would be the same. A 450 series uses a totally different front end. If the front sheet metal is good, about the only expensive part to fix is the brakes and of course it takes 6 instead of 4 tires and they are more expensive than lighter tires. Cabs are the same from late 55 to 59. Fenders are the same from late 55 to 57. 58 came out with dual headlights.
Last edited by crenwelge; 03/08/2010 5:09 AM.
