Drivetrain Noise ID

[240sx_megasquirt]

I have an odd/annoying sound that I suspect is my carrier bearing. The vibration noise only happens in the specific area while lifting off the accelerator and before the rear wheels pull on the engine. The vibration is nonexistent except for this neutral spot between accel and deaccel. I can hold this natural state while going down a hill and the vibration sounds like a bad bearing. It will not do it while out of gear coasting as well.

What is it?