Not sure, Here's some pic links of the 5000 for ya.
I remember it now. Nice truck and it looks very restorable, but you may remember that I was telling you that it is not actually a '63. It is either a '64 or a '65. Most of my books are Chevrolet, but if you post the VIN Number, or the first part of it anyway, I'll try to decipher it for you.
I used to drive a truck similar to it. It was a '62 GMC 6500, 478 V-6, 5-Speed Trans, 2-Speed Rear, Spoke Wheels, 10-20 Rubber, Air Brakes and a GVW of 32,000.
Bill