you will have to make it a process of elimination to be honest, take the front belt off, try it, take the rear off, try it, if that makes no difference, take both belts off, if no different, check the spur and pinion for damage, also free rev the motor (no pinion on).
If you find taking one of the belts off, stops the noise, you know it is that side of the transmission that is causing the problem, so you will need to check the bearings (diff and hub) and the pins on the driveshafts to.
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