1960 GMC Trucks. It’s here from Operation ‘High Gear,’ the… Big GMC Breakthrough In Truck Engines Published June 10, 2024 at 2048 × 1374 in GMC ← Previous Next → 1960 GMC Trucks. It’s here from Operation ‘High Gear,’ the… Big GMC Breakthrough In Truck Engines Source: www.flickr.com / x-ray_delta_one