Use reverse gear at 40mph :)
What happens if we shift in reverse while driving at 60 mph? A driver at the wheel of a Ford Ranger pickup black, shift in reverse while he rolls to 65 kph (40 mph). Result, a lot of noise (squealing of tires), a lot of smoke, the wheels turning in the other direction, the car slowed down and eventually go back. The driver is then able to start running before. So the clutch seems not damaged.