Grigg, I think he may be asking if one of the Art Deco 1 1/2 ton pickup beds will work on his 6400. Those 1 1/2 ton pickups are so "RARE" it'd be a shame, (if you ever found one) to part it out, for just the bed swap.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers