Basic Maintenance - NP231J transfer case oil change - Page 2 - JeepForum.com
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post #16 of 45 Old 02-24-2011, 06:21 PM
greyarea
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Just as a note when that change was made from gear oil to motor oil the formulations of both fluids were different. Modern GL-5 gear oil is no longer corrosive to brass syncros and motor oil no longer contains even half high pressure wear additives.

Just a thought.


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post #17 of 45 Old 02-25-2011, 09:51 AM
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Quote:
Originally Posted by greyarea View Post
Just as a note when that change was made from gear oil to motor oil the formulations of both fluids were different. Modern GL-5 gear oil is no longer corrosive to brass syncros and motor oil no longer contains even half high pressure wear additives.

Just a thought.
Good luck,........it's all personal preference in the end, but NOTHING with a GL5 rating is going in my trans.
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post #18 of 45 Old 02-25-2011, 05:11 PM
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OK, OK Ithink I got it

Manual Transmission & Tranfer case 10-30 motor oil, Should be Changed when?
Still 75-90 GL for Differential ?
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post #19 of 45 Old 02-25-2011, 05:24 PM Thread Starter
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Quote:
Originally Posted by PaulEspo
Manual Transmission & Tranfer case 10-30 motor oil, Should be Changed when?
Still 75-90 GL for Differential ?
No.

10W-30 motor oil for manual transmission
ATF for transfer case
Gear oil for axles

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post #20 of 45 Old 02-25-2011, 05:26 PM Thread Starter
Mean Max
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I change all of my "case" fluids (trans, t-case, axles) annually or anytime those items may have been submerged.

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post #21 of 45 Old 10-11-2011, 12:43 AM
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just a question. i am doing my first full fluid change in my YJ. i fill the t-case through the fill plug correct? the write up doesnt say exactly where to fill it from
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post #22 of 45 Old 10-11-2011, 06:32 AM
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tankinyj, Yes through the fill plug.

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post #23 of 45 Old 10-11-2011, 09:30 AM Thread Starter
Mean Max
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Quote:
Originally Posted by tankinyj
just a question. i am doing my first full fluid change in my YJ. i fill the t-case through the fill plug correct? the write up doesnt say exactly where to fill it from
Seriously?

What other function could a "FILL" plug serve, if not for filling?

The next-to-last photo & caption couldn't possibly be any clearer.

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post #24 of 45 Old 10-11-2011, 03:23 PM
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I have to agree with Max here. I can't think of any other purposes for the fill plug.

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post #25 of 45 Old 10-12-2011, 10:22 PM
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wow... just a question. and to rebuttle you, the AX15 has a drain hole and a fill plug, yet you clearly show filling through the sifhter assembly. was possibly thinking the same thing
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post #26 of 45 Old 10-12-2011, 10:25 PM Thread Starter
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Point taken. But the AX-15 fill plug has limited access, where the NP231 fill plug is readily accessible.

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post #27 of 45 Old 10-13-2011, 09:51 AM
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Quote:
Originally Posted by Mean Max View Post
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!

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/YJ%20Mechanical/P1000089.jpg[/I MG]

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

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010228.jpg[/I MG]

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.

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010230.jpg[/IM G]

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

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010231.jpg[/I MG]

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

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010234.jpg[/I MG]

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

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010233.jpg[/I MG]

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

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1010235.jpg[/IM G]

PLEASE BE RESPONSIBLE & recycle all old fluids!

[IMG]http://i702.photobucket.com/albums/ww27/meanmax/Maintenance/P1000473.jpg[/IM G]

Max
Good job on this write up, i was always nervous about this...and i guess it was for no reason. Easy job, ill do it this weekend

Quote:
Originally Posted by rustywrangler View Post
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.
Noted as well....is this in the FAQ?
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post #28 of 45 Old 10-13-2011, 04:50 PM
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I don't think that is in the FAQ. This shows where the magnet is in relation to the drain hole. Since the case is not transparent, I have to do it in two pictures.




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post #29 of 45 Old 12-14-2011, 01:50 PM
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Cool write up...where'd ya get that spiffy little screw on funnel? I need one of those!
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post #30 of 45 Old 04-13-2012, 04:34 PM
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Excellent write-up. In the first post, you indicated 2.2 pints of ATF, did you intend to say 2.2 quarts? Also, does it matter what type of ATF is used (MercIII; TypeF, etc.)?
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