Can you replace a long bed with a short bed on a 1981 gmc sierra?

Answer 1

You can't accomplish this task and have the truck look the way you want. The long bed has a longer distance between the back of the truck cab and the rear wheel wells. Also the frame of the vehicle is longer with the long bed. If you put the short bed on with the wheel wells over the rear tires, you would have a gap of probably a few feet between the back of the truck cab to the front end of the bed. This would leave that section of the vehicle frame exposed on top along with your driveshaft, exhaust, and whatever else is mounted in that area.