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#1
June 16th, 2019, 09:27 PM
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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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#2
June 16th, 2019, 10:39 PM
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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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#4
June 17th, 2019, 10:38 PM
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Re: Transfer Case oil
Quote:
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#6
June 18th, 2019, 01:49 AM
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Re: Transfer Case oil
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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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#7
June 18th, 2019, 02:13 AM
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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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