General description :
Highly Optioned Sierra Classic
Dark Blue With Blue Cloth Interior
5.7L V-8 Engine W/ 4-Speed Automatic transmission
Air Conditioning, Cruise Control, Tilt Steering Wheel
Power Steering And Power Brakes
Power Locks And Power Windows
AM/FM Cassette Stereo
Owner€™s Manuals And Build Sheet
Did you ever mistake a Chevy pick up for GMC? No wonder as those have been virtually identical apart from the grill and logo since the 20's.
The difference is Chevrolet trucks were marketed towards private users, while GMC was intended for commercial use, so it's more about market segmentation than anything else.