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Unread 04-08-2010, 08:04 PM   #1
Mean Max
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Basic Maintenance - NP231J transfer case oil change

Here is a quick write-up on performing a fluid change on your NP231J transfer case. It's quick & easy, and will go a long way toward keeping your Jeep running smoothly!


Use a 30MM socket to remove the FILL PLUG FIRST to make sure you can refill it afterward.


Now drain the fluid. You can use an old piece of cardboard to keep the fluid from filling your skid plate. I was using a shop lift at the time, so I elected to skip the cardboard (regretfully) this time.


Let it drain until it drips out in individual drops. Then reinstall the drain plug.


I use the spout top from an old gear lube bottle on the top of the ATF quart bottle to refill the T-case.


I also have a spiffy little screw on funnel that makes refilling the quart bottles easier!


Refill it until it comes out of the fill plug, this way you'll know it's full!


PLEASE BE RESPONSIBLE & recycle all old fluids!


Max

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Unread 04-08-2010, 08:37 PM   #2
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Only thing to add would be to sweep out around with your finger to the right in the drain hole. The magnet sits right there and you can see if there are shavings on it or not.
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Unread 04-08-2010, 08:43 PM   #3
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Thanks. This is on my to do list for the weekend!
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Unread 04-08-2010, 09:43 PM   #4
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doing this in the morning thanks
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Unread 04-08-2010, 10:46 PM   #5
bigorangeyj
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could you tell me how much fluid i should buy for my tranny
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Unread 04-08-2010, 11:57 PM   #6
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Originally Posted by bigorangeyj View Post
could you tell me how much fluid i should buy for my tranny
Pick up 3 quarts, you won't use it all but you can use the leftovers to make your own penetrating oil
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Unread 06-01-2010, 04:54 PM   #7
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DAMMIT!
... Those 30mm bolts WON'T come out!!!
... and the one to refill is starting to go round. >_<'
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Unread 06-01-2010, 04:57 PM   #8
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Originally Posted by vodadub View Post
DAMMIT!
... Those 30mm bolts WON'T come out!!!
... and the one to refill is starting to go round. >_<'
I used this.......


.....on this socket


.......to get one like that out of an NP249 the other day.

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Unread 06-02-2010, 09:34 AM   #9
vodadub
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Well ...
The bolt was starting to go round with this...


and this...



So tried with this...


and this...



Nothing was coming out of there so ...
Ended up using ALL of THESE...






And a little imagination...

FINALLY popp'd out
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Unread 06-05-2010, 10:03 PM   #10
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I was able to get mine off with no problem using this:
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Unread 06-05-2010, 10:29 PM   #11
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Drive up on ramps to drain as much as you can if yours is really old and nasty, then pour a 1/2 quart through.
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Unread 07-16-2010, 07:39 PM   #12
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Thanks Max!

Just did my rear T-case seal (what a pain), and had to put torch to my fill plug to get it to crack!!
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Unread 02-24-2011, 07:50 AM   #13
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I just bought my Wrangler and have the Haynes Manual. I’m trying to get this straight in my head. I have a 1995 YJ, 2.5, 5 speed manual trans. So the Manual Transmission takes SAE 75-90W GL-5 Gear Lubricant, Same as the Differential., BUT the Transfer Case takes Automatic Transmission Fluid. I though this was a misprint but you show Auto Trans. In the posting.

Can I use 75W-140 in the transmission and the differential as well for towing?
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Unread 02-24-2011, 08:49 AM   #14
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The AX-15 takes 10W30 oil (I can't comment and your AX-5, but I imagine it would be the same? I don't know anything about putting gear lube into a tranny, is that what the book calls for?) T-case takes ATF, Diffs take gear lube. Engine takes 10W30 of course. :P
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Unread 02-24-2011, 02:42 PM   #15
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Quote:
Originally Posted by PaulEspo View Post
I just bought my Wrangler and have the Haynes Manual. Iím trying to get this straight in my head. I have a 1995 YJ, 2.5, 5 speed manual trans. So the Manual Transmission takes SAE 75-90W GL-5 Gear Lubricant, Same as the Differential., BUT the Transfer Case takes Automatic Transmission Fluid. I though this was a misprint but you show Auto Trans. In the posting.

Can I use 75W-140 in the transmission and the differential as well for towing?
DO NOT use 75-90W GL-5 gear lube in the transmission. The GL-5 has additives that are BAD for the syncro's. The oil spec for our AX-5' and the AX-15's is 10-30 MOTOR OIL. This was confirmed by Chrysler! (see other threads out there about this). I put Mobil 1 10-30 "high mileage" in my AX-5 recently, haven't driven it much yet, but from what I hear it's like "butter" with the 10-30 in it.

The Front and rear Diffs take GL-5 rated GEAR LUBE, 75-90 weight, I used the Wal-mart brand "Synthetic blend" in mine, seems like decent stuff.

The Transfer case does take ATF!

Good luck, hope this helps!
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