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Old 09-10-2010, 03:53 PM   #1
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fluid change

did a basic tune up(plugs, wires, cap, rotor) now i would like to change the front and rear diff fluid and the trans and transfer-case. my question is what fluids to use? i have over 100k miles and all thats been done it topping it off here and there, i'd like to have good clean fluids for the winter. its a '99 4 banger with a 5 speed. i know how to do the diff fluid, how do i change the trans and transfer-case? and i would like to be able to pick everything up at auto-zone, i have a few gift cards sitting around. thanks

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Old 09-10-2010, 04:50 PM   #2
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Bueller...

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Old 09-10-2010, 04:56 PM   #3
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Read over this. Should answer all your questions.

Jeep NV3550 Transmission & NP231 Transfer Case Service

If you have the NV3550 tranny don't use Pennzoil Syncromesh! My advice...
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Old 09-10-2010, 04:58 PM   #4
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Transfer case makes a big mess if you don't take the skid plate down. I made a kind of funnel with aluminum foil to route the fluid down into a drain pan. Otherwise you be using a lot of paper towels!
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Old 09-10-2010, 05:09 PM   #5
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how do i tell what trany i have?
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Old 09-10-2010, 05:11 PM   #6
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They show pics of both on that link. That is the only way I know of how to tell. Unless you've got your build sheet.

AX uses a somewhat normal type bolt for fill and drain, and the NV uses an inverted bolt, where you need a large hex driver.
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Old 09-10-2010, 05:16 PM   #7
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I'm not for sure but I think some early TJ's had the AX5 even. So if it doesn't look familar i'd wait for a little more clarification from someone.
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Old 09-10-2010, 06:14 PM   #8
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would it be in the owners manual?
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Old 09-10-2010, 06:48 PM   #9
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I am not sure on that. I'm pretty sure the manuals are for multiple models at once. Might be easiest to call up your dealership and they should be able to tell you from the VIN.
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Old 09-10-2010, 08:35 PM   #10
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Originally Posted by jwm1986 View Post
Read over this. Should answer all your questions.

Jeep NV3550 Transmission & NP231 Transfer Case Service

If you have the NV3550 tranny don't use Pennzoil Syncromesh! My advice...

Thanks jwm1986, I was just heading out to the garage to do this project and came across your link. Very helpful

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