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Old 11-20-2013, 03:49 PM   #1
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SAE 30 for NV231?

My mechanic recommends to switch from recommended ATF-4 to non-foaming SAE 30 in NV231 transfer case equipped with TeraLow 4:1 conversion. Is it reasonable?

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Old 11-20-2013, 04:31 PM   #2
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Tera's spec calls for a GL-4 80W-90 gear lube which has a similar viscosity to 30W motor oil.

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Old 11-20-2013, 05:53 PM   #3
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Quote:
Originally Posted by Jerry Bransford View Post
Tera's spec calls for a GL-4 80W-90 gear lube which has a similar viscosity to 30W motor oil.
Thank you! Do you have a link to the specs?
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Old 11-21-2013, 12:24 AM   #4
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I'm not so sure that source was correct on the GL-4 80W-90 being the correct lube for the Teralow when installed in a 231, my bet is it was written around a gear based tcase like the Dana 20. Tera's .pdf for install directions for the 231 Teralow has been unavailable all day so I wasn't able to verify it. I think you guys are correct on it requiring ATF when installed into a 231. Sorry for what I now believe was some incorrect info I posted earlier. It was bothering me since I knew the correct lube for a stock 231 is ATF.
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Old 11-21-2013, 11:13 PM   #5
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No problem. I have heard about 30W instead of ATF-4 from many sources including mechanic who works on transmissions for many years, but I was not able to confirm them officially.
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Old 11-21-2013, 11:24 PM   #6
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Use ATF, ATF+4 would be a good choice. I reconfirmed even with the Teralow that ATF is still the correct choice. Gear lube or 30W is only for gear driven transfer cases while the 231 is chain driven which requires ATF.
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Old 11-22-2013, 09:55 AM   #7
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Thank you all! I got an official answer from TeraFlex:

"I use Mobil one syn. ATF in my Teralow. You could use a synthetic motor oil if you want. I worked in a shop where we put Mobil one motor oil in all the 231 T- cases that were repaired there. I belive we used a 5w-30.
Thanks,
Doug."
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Old 11-22-2013, 09:59 AM   #8
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As in the reply to your other thread, that is obviously not an "official" Tera response. The manufacturer of your 231 specifies ATF so that's what I would use in it.

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