Ok u experts plz help me , i hear a weird sound fronm my back right drive train, coming from behind the rim, its only when i switch from drive to revers then gas it and start to roll, and from reverse to drive and gas it then start to roll, its the initla roll period, and its a loud clicking ...like a cv joint on a toyota corolla.. , any input much obliged thanx

 

my service adviser told me its the back right flex coupling. anyone know what that is, or why it broke so early in time of cars life