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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old June 16th, 2019, 08:27 PM
fritz fritz is offline
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Default Transfer Case oil

Hello ,Can someone tell me the proper oil for a 1960 4x4 t case? I have heard that the correct oil is 80 wt. Mineral oil? If so where would that be found? If Mineral oil is correct I am curious as to why mineral oil would be the correct type.

Thank you,
Fritz
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Old June 16th, 2019, 09:39 PM
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Default Re: Transfer Case oil

Mineral oil is pretty common to use in gears back in the old days, but today we have synthetics and cleaner refined oil and you can get longer lasting performance from those.

For my 4x4 transfer case, after much researching, I went with Red Line 75W90 NS GL-5 Gear Oil ( #58304 ). It takes 3 pints IIRC. Sticks to the gears better than any mineral oil and stays protecting even if you've let it sit for a while. And heat don't bother it at all.
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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Old June 17th, 2019, 02:40 PM
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Default Re: Transfer Case oil

Thank you for your reply best advice I gotten! Would you use the same for the transmission?

Thank you,
Fritz
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Old June 17th, 2019, 09:38 PM
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Default Re: Transfer Case oil

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Thank you for your reply best advice I gotten! Would you use the same for the transmission?

Thank you,
Fritz
Yes, i use the same in the transmission. In the pumpkins I use 57904.
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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Old June 17th, 2019, 10:58 PM
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Default Re: Transfer Case oil

thank you for your reply!
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Old June 18th, 2019, 12:49 AM
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Default Re: Transfer Case oil

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Originally Posted by fritz View Post
Thank you for your reply best advice I gotten! Would you use the same for the transmission?

Thank you,
Fritz
I suggest you get the oil for a synchromesh transmission.
Here are some options:
https://www.summitracing.com/search/...rd=synchromesh

GL-5 oil has sulphur in it, GL-4 is worst. It will eat up the synchro in the transmission, I read it can happen in as little as 100 miles.
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Old June 18th, 2019, 01:13 AM
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Default Re: Transfer Case oil

Good point James, All the oils I recommended are non-sulpher oils because you have brass synchros in some of our trannys and we want them protected.
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