SEEMS ...

I would be willing to bet this is your issue. I have had MANY cars come in with no movement on the wheels but after disassembly the barring was clearly destroyed and the issue was solved.

How many miles on chassis and has the barring ever been changed ?

Easy way to check is to get the car at a constant rate of speed and turn left and right while still cont to go straight ( just enough to get load off each corner) and see if noise goes away. Good luck and be sure to post the fix

EDIT: something else i just thought of. Your barring could be on its way going out in the half shaft.It is off an older model teg.