I would think that 5K might be a little too obsessive as it's doubtful drivetrain components are even broken at that point. I would say for the trans/transfer case and diff's 15K would be much more in line with severe service.I plan to do mine at 5k miles (transmission filter, fluid drain and refill) along with the rest of the drivetrain and then the transmission again at 25k, 50k, 75k etc. replacing the filter additionally at 50k. 100k, 150k, etc. Transfer case and differentials every 50k.
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