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Transfer case fluid needs to be changed out every 25,000 miles. Below is maintenance schedule for your vehicle thru 150,000 miles. I know alot of people think that the maintenance schedule is put out by dealerships just to sell services, but please remember that the maintenance schedule is actually made by the engineers that designed the components and came up with the schedule according to wear patterns, and known longevity of fluids before they break down and no longer protect and lubricate the components:
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