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Old 06-16-2010, 08:20 PM   #1
Danny Phillips
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Default Transfer case oil

What is the correct weight and volume of oil for a Dana 20 tx case.
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Old 06-17-2010, 09:21 AM   #2
Michael Mayben
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Default Re: Transfer case oil

I use plain old straight 50wt. Motor oil, fill it up to the bottom of the filler hole with the rig sitting level. That is about 2.5>3 qts. Usually, depends upon how gunked the interior is and how long ya let it drain, and if hot or cold.

The equivalent gear oil would be a straight 80 or 90 wt. Or a 85/90. There are no brass/bronze/zinc/aluminum components as "wear/load" elements in these transfer cases, so typical modern gear oil additives have no effect in the long term.

The viscosity index/ratings for motor oil and gear oils are not the same scale. For example, a 40wt. Motor oil is approximately the same viscosity as an 80wt. Gear lube.
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Old 06-17-2010, 12:11 PM   #3
Danny Phillips
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Default Re: Transfer case oil

Thanks michael. I have to reseal it so I'll try to clean it out as much as possible.
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Old 04-25-2013, 11:53 PM   #4
Erik VanRenselaar
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Default Re: Transfer case oil

At my local tractor supply store, I noticed they carry sae 90 gl-1 mineral oil labeled as Ford tractor transmission fluid. I believe this is the oil that IH specified for the Dana transfer cases.
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Old 04-26-2013, 10:29 PM   #5
Danny Phillips
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Default Re: Transfer case oil

Hey erik: I've already filled it with 50 wt motor oil so far so good. I finally got all the leaks stopped for now in the Scout and my dodge. Hallelujah (so far). Hope this all helps you, leaks suck. Danny
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Old 04-29-2013, 11:56 AM   #6
Mark Pietz
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Default Re: Transfer case oil

Erik,
if that's so, that's very good to know. Also, at my local napa they sell a tractor hydraulic fluid that I believe is gl-1, called by initials, one is think is an "r" for rust inhibitor. Know what I'm talking about?
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