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I am going to change my transfer case fluid. I want to use a synthetic fluid because it should give me a bit better fuel mileage. The manual says to use ATF. I want to use Royal Purple MAX ATF for no better reason than it is the only brand I can find that is synthetic. So my question is, is the transfer case just a set of gear, in which case I am not too concerned about using fluid that is not OEM? Or is it more complicated like a transmission and I should not mess around with different fluids?
1996 Dodge 3500 Laramie 4x4 Ext-cab 12v Auto
Don't sweat the little stuff. Regular 'ole ATF will work fine. Since it is already so thin, I highly doubt you see little if any increase in fuel mileage. My personal preference is Wally World brand. With the difference in price, if there is a difference in mileage it would take years to pay the difference in fuel savings. One of the biggest advantages of running full synthetic in an auto trans is the fluids ability to withstand higher temps without damaging fluid. Your transfer case doesn't develop the heat of a torque converter.
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