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Old 04-14-2010, 05:07 PM   #1
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Exclamation **Transmission and Transfer case question**

ok with the tranny, i have an 89 yj 4cly which i think has an ax-5 trans? my question is, what is a good oil to use in it/what kind? and how much oil does it take? And how much, and which oil is good for the Transfer case? thanks

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Old 04-15-2010, 06:12 PM   #2
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Anyone???

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Old 04-15-2010, 06:16 PM   #3
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AX-5 yes... which oil, not sure. If you call up your local parts store (NAPA) they should have the specifics. It's either going to be a specific weight gear oil or it could be ATF. The T-case I know for sure uses ATF, any kind. Not sure on capacity though. Just drain it, and fill it till it drips out the fill hole a bit.
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Old 04-15-2010, 06:18 PM   #4
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is there like a good brand to go with?
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Old 04-15-2010, 06:24 PM   #5
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Castrol, Mobile, or Royal Purple*

Royal Purple is a high performance brand, very good stuff... but a bit pricey.
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Old 04-15-2010, 06:26 PM   #6
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i heard about royal Purple. i was gonna get tht cause i figured it may help my trans a little.(which it needs help)
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Old 04-15-2010, 08:58 PM   #7
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sorry but how do u drain ur transfer case
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Old 04-15-2010, 09:23 PM   #8
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Read here - Jeep NV3550 Transmission & NP231 Transfer Case Service

There is a fill plug and a drain plug.
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Old 04-15-2010, 09:44 PM   #9
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any atf in the t case is fine, but do not go by the specs at the store, or in any manual on the trans fluid. it will say regular 80w90 gear oil, gl5 is spec, and every manual is wrong. gl5 eats the brass parts inside the trans and causes failure. use any synthetic 80w90 that is good for brass synchros, penzoil synchromesh, or royal purple are good choices.
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Old 04-15-2010, 09:45 PM   #10
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For the ax-5 tranny, redline mt-90 is supposed to be the best. Just changed mine with redline and shifts/feels great. I used ATF for the transfer case..
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Old 04-15-2010, 10:51 PM   #11
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will 75w90 be ok???
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Old 04-15-2010, 11:02 PM   #12
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and does anyone know how much oil the Trans/Transfer case holds???
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Old 04-16-2010, 11:48 AM   #13
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do u know what size of socket that will come out with
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Old 04-16-2010, 01:36 PM   #14
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i put 4 quarts of pennzoil synchromesh in mine last night. spec is 3 1/2 qts but i filled through the shift tower

atf+4 for the tcase. i think it held 1 1/2 quarts.

75w90 is fine for the ax5 if you can find any non gl5, which i dont think you will. as mentioned, the gl5 eats brass synchros.

i dont recall the size but i will look tonight if i remember, since its still laying under the jeep.
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Old 04-16-2010, 07:44 PM   #15
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so whts the easiest way to fill the Trans?

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