How do you install rear drum brakes on a 1996 GMC Sierra 3500 truck?

To install rear drum brakes on a 1996 GMC Sierra 3500, start by safely lifting the rear of the truck and removing the tires. Next, remove the drum by unscrewing any retaining screws and pulling it off the hub. Replace the brake shoes, ensuring the springs and hardware are correctly positioned, then reattach the drum, making sure it spins freely. Finally, reinstall the wheels, lower the truck, and pump the brake pedal to seat the new shoes.