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Old 06-13-2010, 08:14 AM   #1 (permalink)
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What transfer case fluid?

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?

Thanks

Peter
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Old 06-13-2010, 04:05 PM   #2 (permalink)
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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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Old 06-13-2010, 07:02 PM   #3 (permalink)
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ok, thanks


I ended up going with Mobil 1 synthetic. You are right, the fluid I drained was pretty thin, but it only cost me $20 for 3 litres of Mobil and it would have been $11 for a gallon of regular ATF
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Old 03-02-2013, 04:57 PM   #4 (permalink)
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Not to bring up from the dead but does it matter if you use at dextron /mercon In the t case?
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97 cummins auto 2500 eclb 4x4. Gauges, 5inch mbrp exhaust, s&b intake, KDP tabbed, 0 plate slid forward, ARP studded. Timing 18.5 phatshaft 62/65/12 ,BD boots, DFI 5x14, 4k gsk, 60k valve springs. CPP traction bars, TRE built valve body and billet single converter. Mag hytec dd trans pan.

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Old 03-02-2013, 05:37 PM   #5 (permalink)
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I use dexron II in the entire transmission. Says right on the dipstick it can be used.
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Old 03-02-2013, 06:50 PM   #6 (permalink)
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I'm assuming your talking about the t case?
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97 cummins auto 2500 eclb 4x4. Gauges, 5inch mbrp exhaust, s&b intake, KDP tabbed, 0 plate slid forward, ARP studded. Timing 18.5 phatshaft 62/65/12 ,BD boots, DFI 5x14, 4k gsk, 60k valve springs. CPP traction bars, TRE built valve body and billet single converter. Mag hytec dd trans pan.

03 3500 h.o auto. DRW, cclb. 4x4. S&b cold air. 5" diamond eye exhaust. Smarty s-06, cumminscat -2 mic. Mag hytec double deep trans pan.
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Old 03-02-2013, 08:42 PM   #7 (permalink)
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I never got around to changing the transfer case fluid, but if i did i would runs standard dexron II. This case is going out the door in a few months anyway
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Old 03-03-2013, 01:03 PM   #8 (permalink)
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My 96 called for ATF I used ATF+4 witch is synthetic, got the Wal-Mart brand.

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