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Put the rear axle up on jack stands, start the engine, put it in gear and let up on the clutch so the back wheels are spinning in air. Then get under there and listen for where the noise is coming from. Our hearing is very directional and you can tell whether it's coming from the front, the back, or the middle of the tube. To get an even better listen get a long screw driver, press the handle against your ear and touch the other end to the torque tube in various places to "hear inside" what's going on. I did all of that to diagnose a problem with mine.
If you can't hear the noise because there is no load on the drive train, have someone sit in the driver's seat and apply the brakes slowly while reving the engine slowly to maintain the drive train speed while putting the load of the rear brakes on it.