Basic Maintenance - NP231J transfer case oil change - Page 3 - JeepForum.com

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post #31 of 45 Old 07-13-2012, 09:04 PM
animal0307
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Quote:
Originally Posted by grivera View Post
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.)?
Since you didn't your answer I'll ask also. Does is matter what type I use? I have an auto trans so if I can just use the same type in both it's one less jug to carry around.

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post #32 of 45 Old 07-13-2012, 11:07 PM Thread Starter
Mean Max
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At the time I originally created this writeup, I used the capacity that had been listed elsewhere because I couldn't recall exactly how much I had used. For the record, it takes just a bit less than 2 quarts of ATF when you simply do a "dump & fill" fluid service.

The type of ATF to use is 100% irrelevant, I recommend to use the cheapest available. Different types of ATF exist because of the different requirements needed in the friction modifier aspects of the different fluids, specifically with respect to the friction materials of the bands & clutch plates. Your transfer case does not contain any such material, therefore the friction additives in the different types of fluid are without consequence. Simple lubrication is the only goal.

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post #33 of 45 Old 07-14-2012, 11:33 AM
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Cool. Thanks Max
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post #34 of 45 Old 07-24-2012, 06:15 PM
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Just a note, if you don't have metrics that big with you when you might need to do this ( for example after having to have a logger pull you out of an impromptu mud hole with his skidder). a 12pt 1 3/16 socket will fit the drain and fill plugs nicely.
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post #35 of 45 Old 07-27-2012, 05:59 PM
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Here is how I refilled mine for anyone else that had troubles at first. Short wide funnel and a short piece of vinyl tubing. I had just enough between the extension housing and the tub to empty a whole bottle with ease. warning the tubing I used was fit snug in the fill port and I managed to over fill the case by a far amount and wasted a good deal into my oil pan.

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post #36 of 45 Old 10-06-2012, 08:24 PM
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Thanks for the write up.

I just did this a few hours ago, and it was super easy. The only bad part was that there was barely any old fluid in there! Good to go now.
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post #37 of 45 Old 06-26-2014, 10:17 PM
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Just to be clear here, how much ATF fluid do you need for this drain and fill?
On this Fluid Capacities thread, it says 1.1 quart http://www.jeepforum.com/forum/f9/fa...cities-489932/

But you're saying 2.2 quart.

If anyone could let me know, that'd be great. I'll be diving into this this weekend.
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post #38 of 45 Old 06-26-2014, 10:37 PM Thread Starter
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Quote:
Originally Posted by Nishbot View Post
Just to be clear here, how much ATF fluid do you need for this drain and fill?
On this Fluid Capacities thread, it says 1.1 quart http://www.jeepforum.com/forum/f9/fa...cities-489932/

But you're saying 2.2 quart.

If anyone could let me know, that'd be great. I'll be diving into this this weekend.
Apparently, the technical accuracy is elusive.

Since creating this thread a long time ago I have opened my own Jeep-only custom shop. I routinely drain & refill 231 transfer cases & have never exceeded 2 quarts. Usually it's around 1 & 3/4 quarts.

Don't over think it, grab 2 quarts of the cheapest ATF on the shelf & change it out.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #39 of 45 Old 06-26-2014, 10:42 PM
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Thanks for the advice Max!
ATF+4 usually comes in 1 quart bottles, and I didn't want have to buy 3 quarts if I didn't have to.
So I'll be picking up 2 quarts of ATF tomorrow and diving in.

Thanks again!
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post #40 of 45 Old 06-26-2014, 10:47 PM
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By the way, Max, when you tighten the bolts, what torque do you tighten them to? Or if it's tight enough, that's all that matters?
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post #41 of 45 Old 06-27-2014, 12:19 AM Thread Starter
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It doesn't have to be ATF4, you can use ANY brand, type, flavor, etc. ATF that you want. The only difference between ATF specifications is the additives package, concerning how the fluid reacts to the friction material inside the transmission. Your NP231 does not have any such friction material, the fluid provides only basic lubrication.

Just snug. NOT gorilla tight, it's only aluminum!

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #42 of 45 Old 07-04-2014, 06:38 PM
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Hey Max! Thanks for all of the advice! Did this today. Seriously took me no more than 20 min! One thing I didn't do was scrape to the right to check the magnet for shavings. Should I go back in there and clean that magnet? Also the oil that came out before, definitely was not ATF. It looked like motor oil. Is it ok to mix ATF with motor oil in the TC?

Also, mine had Allen bolts instead of 30mm bolts. Just saying..

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post #43 of 45 Old 10-04-2014, 05:15 PM
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so what do i do if the owner before me put gear oil in the t-case? should i just drane and refill with aft+ or what. Plz help im rebuilding in now and want to know if i should clean out as much as i can or will some gear oil not matter?
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post #44 of 45 Old 08-31-2015, 08:17 AM
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Quote:
Originally Posted by animal0307 View Post
Here is how I refilled mine for anyone else that had troubles at first. Short wide funnel and a short piece of vinyl tubing. I had just enough between the extension housing and the tub to empty a whole bottle with ease. warning the tubing I used was fit snug in the fill port and I managed to over fill the case by a far amount and wasted a good deal into my oil pan.

Kinda looks like you left your drain plug out..
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post #45 of 45 Old 04-03-2016, 07:03 PM
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T case oil

How often do you perform this pm? curiosity
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