Rattling noise help!

Okay recently my truck has developed a weird noise which is a very loud rattle. It only does it when letting off the throttle and coasting it will start and then stop. I can't figure it out. I have replaced a wheel bearing, u joint in rear shaft, put used cv joint it, carrier bearing and even another transfer case in it. I am just wanting too get this fixed it's so getting on my nerves thanks.


I have a video of what it sounds like when it does it.
http://s36.photobucket.com/user/gtw...7-4926-A3F5-2403A8320C34_zpsnae5ysho.mp4.html

 

When I had my celica, it developed a rattle right before I sold it. I took it to my mechanic and he looked around and it turned out it was a loose engine mount. Not sure if that's what it is but it might be something worth checking..