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A fourth confirmation of an overpriced ARB diff/gear/transfer box raised aftermarket breather.
Purchased a kit myself for an old GQ a few years ago but did modify like a worrying wart as usual prior to an underwater adventure upcoming down in Tasmania.
Maximum $20 at any Pirtek/Enzed type joint for extra fittings to create an up/down type natural airlock for unfortunate flooded engine bay debacles is my unprofessional R&D advice