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Mentok mate, are you 100% sure the noise aint coming from the Patrols arse end?
Just thinking you’re towing in 2WD highway hauling (unknown weight to us) maybe she’s dry and worn back there?

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Plasnart mate reminded on last post that one of our old work TD42T’s still does the same exactly. Has been doing it for 2-3years now so not sure what’s all our answers now sorry mate!
EDIT: A 5th...

My TD42T rattles big time at idle in neutral. Depress the clutch the rattle disappears. Release the clutch it's rattle time again. Have been told this is a symptom of worn thrust bearing. Sounds...

From what you describe above Mentok mate it does sound like Thrust bearing to my nuffy understanding.
Run outside to your carport now and fire it up in neutral then see if it sounds the same every...

Love the rear draws mate........

Nice rig ya got there

Gday mate, welcome aboard. Thats a beaut looking rig, Now lets see some mud on her:)