Knocking Noise In Rear End
 

Alright, so for the last few days I've had some sort of knocking noise coming from under the rear of the car, and it would happen intermittently, and I couldn't find any way to provoke it. I was backing up my driveway tonight, and it's fairly long. But I could feel it in my seat loud and clear. Any guesses as to what this may be? I haven't dug into it yet, but I'd like some ideas to try before I get into it tomorrow.
Thanks
Nick

Might be something loose underneath the vehicle (exhaust pipe for example). Make a sound video of the knocking noise.

My guesses

1/ torn diff mount rubbers
sound like a muted thud and it happens when going over bumps

2/Muffler mounts hitting body

Found any solution ?