Interesting you said you have new uni joints......has the noise started since you installed the new joints?
Looking back at the gearbox sections, if it’s only happening in 4th then that is when the gearbox operates differently to 1/2/3.
Couple of things it could be, it could be the lay shaft Is not disengaging and what you hear is the layshaft gears spinning or catching or one of the intermediate gears on the bronze bush is sticking maybe.
Check the oil for sparkles or gold colour.
It looks as though JD gets the prize on this one. It seems that the anti rattle spring is MIA. But I shifted the transfer lever into low range then back into high, did a quick 20 km round trip to Williamtown RAAF base and the whine has all but disappeared (you can see how often it gets shifted into low range). There is still a soft whine at those speeds (over and above the normal gearbox whine) but maybe a new anti rattle spring will help alleviate that.
Hopefully that has solved (time will tell). Thanks a lot to everyone who responded, I’m astonished at both the exceptional level of expertise in AULRO and its members willingness to pass this on to complete strangers. Hopefully I can pay it forward in the future.
Cheers,
Matt
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