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89YJproject 04-14-2010 05:07 PM

**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

89YJproject 04-15-2010 06:12 PM


AzTJ 04-15-2010 06:16 PM

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.

89YJproject 04-15-2010 06:18 PM

is there like a good brand to go with?

AzTJ 04-15-2010 06:24 PM

Castrol, Mobile, or Royal Purple*

Royal Purple is a high performance brand, very good stuff... but a bit pricey.

89YJproject 04-15-2010 06:26 PM

i heard about royal Purple. i was gonna get tht cause i figured it may help my trans a little.(which it needs help)

retiredk24 04-15-2010 08:58 PM

sorry but how do u drain ur transfer case

AzTJ 04-15-2010 09:23 PM

Read here - Jeep NV3550 Transmission & NP231 Transfer Case Service

There is a fill plug and a drain plug.

jpdocdave 04-15-2010 09:44 PM

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.

djl7780 04-15-2010 09:45 PM

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..

89YJproject 04-15-2010 10:51 PM

will 75w90 be ok???

89YJproject 04-15-2010 11:02 PM

and does anyone know how much oil the Trans/Transfer case holds???

retiredk24 04-16-2010 11:48 AM

do u know what size of socket that will come out with

whitebuffalo 04-16-2010 01:36 PM

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.

89YJproject 04-16-2010 07:44 PM

so whts the easiest way to fill the Trans?

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