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Old 05-05-2014, 09:06 AM   #1
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Help a noob out!

Hey guys! I'm the proud new owner of a '94 YJ SE (4x4, 5 spd manual, 4.0, soft top), and I'm going through and doing a checkup of all the important maintenance items. I have a few questions that I haven't found through the search yet, so I'm wondering if maybe someone could chime in.

1.) I have no manual with no specs. How do I go about finding which transmission/differentials/transfer case I have? Does any of this even matter when it comes to fluids? I tried using the VIN, but that doesn't give detailed info.

2.) Am I overlooking a spot to actually check these fluid levels? None of my previous vehicles with manual trans. have had a dipstick, but being a Jeep noob, I thought I'd ask.

3. ) There's a very small leak around the bell housing. My nephew has an '87 model, and his leak in the same area was the clutch cylinder. Thoughts?

Thanks a bunch! I'm sure I'll be checking back in regularly as I start getting this thing adventure-ready!
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Old 05-05-2014, 09:50 AM   #2
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take pictures of the front and rear dif cover then post it here.

the 5 speed manual is called an AX-15
and i believe the transfer case is called an NP321( dont quote me on that though)

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Old 05-05-2014, 11:43 AM   #3
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1. Stick you have an AX-15 trans, NP-231 Transfer Case, Dana 30 front axle , and a Dana 35 rear axle.

Fluids can be found by description on almost any web site or parts house

Trans, front and rear axles use 75W-90 gear lube or 10W-30 motor oil.
Transfer Case uses ATF Dexron 4
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Old 05-05-2014, 11:48 AM   #4
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2. No dipstick for the trans. It has a plug passenger side where the level is checked and filled.

3. Drips or suspected leak on bell housing is not always the clutch. Check by rubbing the drip fluid in your hand. Brake fluid has a feel to it.

That area is where fluids can collect by gravity air flow in the engine bay. It is the lowest point.
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Old 05-05-2014, 12:28 PM   #5
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Quote:
Originally Posted by jokerchief462 View Post
1. Stick you have an AX-15 trans, NP-231 Transfer Case, Dana 30 front axle , and a Dana 35 rear axle.

Fluids can be found by description on almost any web site or parts house

Trans, front and rear axles use 75W-90 gear lube or 10W-30 motor oil.
Transfer Case uses ATF Dexron 4
Id use gear oil in the diffs and 10w-30 in the trans.
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Old 05-05-2014, 02:10 PM   #6
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that leak could be rear main seal...mine has that just havent gotten around to it
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Old 05-06-2014, 09:00 AM   #7
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Thanks guys! That's just what I needed.
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Old 05-06-2014, 09:10 AM   #8
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+1 for rear main seal.. Had that issue already. For gear ratios, ratio should be stamped on tag which is on the differential.. Probably 3.07..
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Old 05-09-2014, 05:47 PM   #9
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x3 on rear main seal. Ran across and fixed that issue back in March. Take a look at the first link to confirm fill and drain plugs and the second link for how to change the tranny fluid.

Fluid Fill & Drain Locations

AX-15 Manual Transmission Service
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Old 05-09-2014, 07:20 PM   #10
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I'm kinda off topic, but one of the most important maintenance habits to develop after your fluids and grease is your frame maint. Many jeeps have plates welded on just about where the rear leaf shackles are on the frame. Salt and crap in general lays inside the frame and rots from inside out. Next time you're at the carwash, stick the wand into one of the frame hole and watch the crap spew out. Do this on a regular basis and it'll help keep the frame from rustin thru
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Old 05-09-2014, 11:29 PM   #11
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I would Not use 10w30 in the difs. 75w90 is what the book call for I think, that's what I run.
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Old 05-10-2014, 01:28 AM   #12
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I would Not use 10w30 in the difs. 75w90 is what the book call for I think, that's what I run.
x2. I run 75w90 in mine as well.
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Old 05-10-2014, 11:35 AM   #13
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This is an old Car and will need work from time to time, you should get a Factory Service Manual if your going to do the work yourself, the other books don't cover the main things you really need to know to do the job right the first time, and not have to do it over, right the second time around!
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Old 05-10-2014, 11:57 AM   #14
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X2 on the factory service manual. It has every piece of the entire thing blown up and listed. While this forum is fantastic, the manual is a great tool as well, especially if you're just getting to know the jeep.

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