Check in the driver side door jamb for the GMC truck ID plate. If there it will have the trucks ID/VIN number, and the gvw weight rating. I'm pretty sure it's a 3 ton, or 3 1/2 ton, & not a 2 1/2 ton.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers
