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-   -   Basic Maintenance - NP231J transfer case oil change (http://www.jeepforum.com/forum/f12/basic-maintenance-np231j-transfer-case-oil-change-1009078/)

Mean Max 04-08-2010 08:04 PM

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 :cheers2:

rustywrangler 04-08-2010 08:37 PM

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.

linusb 04-08-2010 08:43 PM

Thanks. This is on my to do list for the weekend!

bigorangeyj 04-08-2010 09:43 PM

doing this in the morning thanks

bigorangeyj 04-08-2010 10:46 PM

could you tell me how much fluid i should buy for my tranny

minnbowhunter 04-08-2010 11:57 PM

Quote:

Originally Posted by bigorangeyj (Post 9250783)
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

vodadub 06-01-2010 04:54 PM

DAMMIT!
... Those 30mm bolts WON'T come out!!!
... and the one to refill is starting to go round. >_<'

Mean Max 06-01-2010 04:57 PM

Quote:

Originally Posted by vodadub (Post 9557001)
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.

Max :cheers2:

vodadub 06-02-2010 09:34 AM

Well ...
The bolt was starting to go round with this...
http://www.bolichedelrepuesto.cl/img...a-de-medio.jpg

and this...
https://www.bargaintools.co.uk/store/images/501792.jpg


So tried with this...
http://www.power-tools-pro.co.uk/ima...driver_500.jpg

and this...
https://www.bargaintools.co.uk/store/images/501792.jpg


Nothing was coming out of there so ...
Ended up using ALL of THESE...
http://www.bolichedelrepuesto.cl/img...a-de-medio.jpg
https://www.bargaintools.co.uk/store/images/501792.jpg
http://www.prestoimages.net/graphics...pd249601_1.jpg
http://www.cinemagadgets.com/images/Steel-Rod.gif


And a little imagination... :cheers:

FINALLY popp'd out

cubewhiz 06-05-2010 10:03 PM

I was able to get mine off with no problem using this:
http://hometoolsrus.com/images/3f811...a2c13f_300.jpg

imstillatwork 06-05-2010 10:29 PM

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.

Sleuthhound 07-16-2010 07:39 PM

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!!

PaulEspo 02-24-2011 07:50 AM

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?

Sleuthhound 02-24-2011 08:49 AM

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

GJeepFan 02-24-2011 02:42 PM

Quote:

Originally Posted by PaulEspo (Post 11036984)
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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