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Unread 07-06-2013, 01:25 PM   #1
Oily
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Diferential And Transfer Case Oil ?

Rear Dana 20, Front Dana 30, D300 transfer case.
All 90 weight, correct ?

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Unread 07-06-2013, 06:22 PM   #2
CSP
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Doesn't have to be 90wt.

You could use 75w-90, 75w-120, 80w-90, etc.

What's important is that the axles get oil rated as GL-5. The transfer case can use GL4 or GL5.
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Unread 07-06-2013, 07:34 PM   #3
Tweeter00801
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Quote:
Originally Posted by CSP View Post
Doesn't have to be 90wt.

You could use 75w-90, 75w-120, 80w-90, etc.

What's important is that the axles get oil rated as GL-5. The transfer case can use GL4 or GL5.
I've heard the argument for GL4 in the transmission, but why is it important for the diff to have GL5? I'm curious since I too am about to lube up the diff.

Can I use GL4 on the Diff?
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Unread 07-06-2013, 10:36 PM   #4
brownbagg
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its 90 weight
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Unread 07-06-2013, 10:56 PM   #5
CSP
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GL5 is rated for hypoid gear sets. Differential gears are hypoid gears (the shape of the cut) and GL4 isn't rated for the pressures that hypoid gears see.
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Unread 07-07-2013, 07:02 AM   #6
shadoow
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my setup is dana 20, dana 30 and dana 300, and T177. I use GL-5 in all the danas and GL4 in the T177
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Unread 07-07-2013, 10:57 AM   #7
Oily
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Hmm. Next question(s). How can I tell if it is GL-4 or GL-5 ? What is the difference ?
The thing is, I drill oil wells for a living. We use 10wt (hydraulic fluid), 30wt non detergent chain oil, 10w40/50w motor oil, an 90w gear oils. We use a lot and keep a lot on hand in bulk. They allow us to take some for personal use (even diesel fuel, small quantities for off road use). I don't remember the last time I bought oil.
I am not with the same company from which I refilled an old 5qt oil jug, so I can not refer back to the original label.
Thanks.
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Unread 07-07-2013, 08:13 PM   #8
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The oil container will be marked with an API service rating. This will be GL4 or GL5.
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Unread 07-08-2013, 05:29 AM   #9
roboto65
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I have heard of guys that run straight 50 wt in there transmissions.
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Unread 07-08-2013, 07:57 AM   #10
CSP
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That straight 50 wt is 50wt motor oil. Motor oil viscosity and gear oil viscosity is measured differently and 50wt motor oil is about the same as 80wt gear oil.
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Unread 07-08-2013, 08:05 AM   #11
roboto65
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Sorry yeah meant to say 50wt Motor oil I tryed finding some but did not look to hard yet LOL
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