I ran my diff breathers along the chassis rail up to the engine bay fire wall...., gearbox / transfer case are still on the todo list
As others have said the rear diff factory breather is useless and terminates in the chassis cross member. Whilst The front diff and gearbox / transfer case go into he passenger side guard (3 metal tubes) - depending on your type of driving / depth of river crossings they recommend to relocate to the firewall as well
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