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Unread 05-06-2012, 07:51 AM   #1
discoverychris
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Transfer case oil

I have a 92 YJ with NP231 transfer case terra low kit. I put ATF in it but it's super noisy and gets hot! What do you guys think about 75w-90 or some grade of gear oil?

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Unread 05-06-2012, 07:59 AM   #2
BlueRubiconrich
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try royal Purple
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Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
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Unread 05-06-2012, 08:23 AM   #3
discoverychris
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I heard the oil has to be thin enough to get to the top gears. What weight oil do u think?
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Unread 05-06-2012, 08:33 AM   #4
ninjakid
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Putting something that thick in wouldn't end well.
Some people say 5w30 or just plain 30 weight.
Are you saying the TC is overheating or the fluid?
What brand were you using?
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Unread 05-06-2012, 07:49 PM   #5
BlueRubiconrich
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you should ask the people who made the 4 to 1 kit
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Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
51 M100 1/4 ton Jeep trailer
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Unread 05-06-2012, 09:09 PM   #6
jnicewan
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Dont use gear oil, the noise its making is not because of using the "correct" oil. The bearing design and chain are the reasons for using thin oil. If I was going to change the oil at all for something a little thicker I would only try something like 30-40 weight motor oil but do that at your own risk.

How do you know its getting hot and what are you comparing the heat too? I would say that if you have noise and possibly excessive heat then you probably installed something wrong.
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Unread 05-07-2012, 01:09 PM   #7
JeepinJeremy
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How old is your tera low case? When was the last time you have taken it apart? If in fact you have a tera low 4 to 1 Front case and depending on the age and abuse on it, your planetary is most likley getting ready to go out on you. Those cases are noisy new out of the box and they do require more maintenance than regular tcases. Try using an ATF+4 if its not to late but depending on whats happened the large ring gear and straight cut planetary gears are most likely the culprit of your noise.
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