Squeal when decelerating

[CookedVy]

Hey guys. I’ve had this squeal coming from my vz Ute but only under decelerating and not using brakes. When you put in in neutral and roll the noise goes away. It only squeals when I’m in gear and off the accelerator. I’ve had the clutch checked as the mechanic though it could be the thrust bearing but the clutch was completely fine. Has anyone else had this happen and know what the issue was? I can get a video of the noise when I’m in the car next. But it sounds like metal screeching.

 

[Fu Manchu]

What’s the drive belt like?
Have you got it off and inspected it for signs of slippage?
Is the tensioner within the right mark on it?
Do the drive pulleys have signs it’s been slipping or are any of them have play in the bearings?