1960 GMC Trucks. Operation ‘High Gear’ pays off with the… Big GMC Breakthrough In Truck Cabs And Dimensions Published June 10, 2024 at 2048 × 1378 in GMC ← Previous Next → 1960 GMC Trucks. Operation ‘High Gear’ pays off with the… Big GMC Breakthrough In Truck Cabs And Dimensions Source: www.flickr.com / x-ray_delta_one