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Old 08-24-2011, 12:36 AM   #1
Mikeylala's Avatar
Join Date: Aug 2011
Posts: 7
transfer case fluid/ transmission fluid

i have a 95 wrangler with a np 231 transfer case what fluid should i run in it, atf? i live in chicago and it get super cold here.

and whats my capacity of my manual transmission? and what fluid should i run in that?

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Old 08-24-2011, 01:16 AM   #2
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its a 4.0 L 6C.

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Old 08-24-2011, 10:31 AM   #3
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Join Date: Dec 2010
Posts: 551
Recommended fluid for the t-case is atf+4, although any atf should be fine, +4 is just what chrysler uses in everything.
As for the manual transmission, most use syncromesh with good results. Some use 10w30 motor oil, mt1, or 75w90 gear oil. If you use gear oil, which I believe is what the owners manual calls for, make sure you get oil that is NOT for limited slip differentials, it has additives that will wear out the brass syncro blocking rings. Not sure on the quantities for the 6 cyl., but my 4 cyl. takes 3.5 quarts.
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Old 08-24-2011, 12:09 PM   #4
Join Date: Dec 2010
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For the transmissions, I used synthetic 10w30 almost a year ago and have no issues so far.
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Old 08-29-2011, 10:47 PM   #5
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Location: Norfolk, VA
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I went with Redline and haven't had a problem. Cost a little more but you get what you pay for and unless you submerge alot you don't change that often.

Differentials: Redline 75w90
Manual Tranny: Redline MT-90 3.5qts (75w90 w/o additives)
Transfer: Redline 30604 1.5qts (ATF 4)
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