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Old 01-06-2013, 08:37 PM   #1
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ATF or Synchromesh in the np231 transfer case?

Ok,

I've searched here, there, and have googled so much that hair is growing on my palm...

Is it OK or even preferable to use Pennzoil synchromesh in the np231 transfer case?

Am I better off with ATF? What brand(s)?

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Old 01-06-2013, 08:55 PM   #2
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My transnission man tells me to run mobile 1 5w30 in my AX15 and t-case so that is what I run

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Old 01-06-2013, 09:27 PM   #3
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What is suppose to be better in synchromesh?

I just did my tsace this year with atf, havent had a problem yet.
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Old 01-06-2013, 11:59 PM   #4
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ATF, Synchromesh, whatever floats your boat. There seems to be a lot of hatred towards Pennzoil though.

If you ask me, throw ATF in it.
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Old 01-07-2013, 09:27 AM   #5
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The only thing I am hesitant about is putting synchromesh in the tcase. It might be too thick for the tcase oil pump to pick up and move properly. I guess there really aint nothing in there that needs it anyhow. I'll go with a good synthetic ATF.

I'm going to try it in my AX-5, however. If it doesnt make a difference in shifting then I will try Mobil 1 on the next go around.

There's so many differences of opinions and experiences out there that I would rather trust my YJ peeps here than anyone else.
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Old 01-07-2013, 10:27 AM   #6
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I just changed all my fluids and used ATF. Remember ATF is high detergent... I don't know about the Mobil 1. I imagine it is somewhat detergent, but I don't know the specifics on it.
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Old 01-07-2013, 11:27 AM   #7
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Well we all are going to have our opinions, however I decided to go with the advice from the man I have trusted for over 20 years on what type of fluid to run. He has been telling me to run the Mobile 1 in standard shift transmissions for years. Now there are some transmissions out there that do use gear lube, but the later model, aluminum case type of transmissions he recommends Mobile 1.
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Old 01-07-2013, 08:50 PM   #8
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I pulled my tcase today to install an SYE, and while I'm there I drained my tranny for a quick fluid change... Sumbitch, gear oil came out. This is from the PO and I really hope they used a GL3 or GL4 oil and not GL5. I didn't see any brass in the drain pan, so hoping for the best.

I got some ATF 4+ for the tcase today, and Pennzoil Synchromesh for the tranny.
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Old 01-07-2013, 08:54 PM   #9
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I use Royal Purple Gear oil in my BA-10 and Royal purple ATF in my T Case. I was having shifting problems with my Trans, just wasn't very smooth, when I drained it and put the RP back in, she smoothed right out. Love that stuff.
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Old 01-07-2013, 09:04 PM   #10
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I plan on using Mobil 1 Synthetic 10w-30 when I fill mine up tomorrow, thats what I seem to hear/read everywhere I turn.
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Old 01-08-2013, 12:11 AM   #11
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Synchromesh in my AX5, ATF+4 in my NP231, Seriously, if you run motor oil or Synchromesh in your Tcase you will burn out your pump.
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Old 01-08-2013, 09:25 AM   #12
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Quote:
Originally Posted by 2xs View Post
Synchromesh in my AX5, ATF+4 in my NP231, Seriously, if you run motor oil or Synchromesh in your Tcase you will burn out your pump.

No you wont. Ran Mobile 1 in my transfer case for over 2 years with no problems. Took the t-case to my tranny shop for him to check it out and replace anything that needed to be replaced. Everything inside was just fine including the pump.
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Old 01-08-2013, 10:02 AM   #13
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Quote:
Originally Posted by 2xs View Post
Synchromesh in my AX5, ATF+4 in my NP231, Seriously, if you run motor oil or Synchromesh in your Tcase you will burn out your pump.
This was my biggest concern... Fluids too thick for the pump. I've come to the conclusion that the np231 needs basic lubrication and has been running for millions of miles on ATF just fine.

My AX-5 on the other hand likely had GL5 in it when I drained it yesterday. I'll chance running synchromesh in it since it may be headed for a rebuild anyway.
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Old 01-08-2013, 06:15 PM   #14
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Quote:
Originally Posted by rykemc View Post
My transnission man tells me to run mobile 1 5w30 in my AX15 and t-case so that is what I run
Is this the same guy that will be rebuilding both. Seriously, 5w30 is fine for both. I run 75W90 full syn in my AX15 but full syn 5W30 is fine also. I use ATF in my transfer case. It's just preference.
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Old 01-08-2013, 06:24 PM   #15
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Oil is oil. Something is better than nothing... So many opinions on this subject it's stupid. Here is mine. It's your jeep do what ya want. You will never get a solid answer on this topic on an Internet forum.
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Old 01-08-2013, 06:31 PM   #16
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Originally Posted by RednekYJ View Post
Oil is oil. Something is better than nothing... So many opinions on this subject it's stupid. Here is mine. It's your jeep do what ya want. You will never get a solid answer on this topic on an Internet forum.
AMEN!!!!!!!!!!!!!
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Old 01-08-2013, 06:49 PM   #17
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whats the difference between ATF and ATF+4?
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Old 01-08-2013, 08:14 PM   #18
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Quote:
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whats the difference between ATF and ATF+4?
ATF covers all types of the hydraulic fluids that fall in the category, When our Jeeps were new they used Dexron ATF. Currently all Chrysler products use ATF+4, which is a full synthetic type of ATF

ATF = Automatic Transmission Fluid
Dexron, Type F and +4 are all different blends or additives, with the +4 a synthetic blend.
There are other blends, I only listed the majority of what you will most likely hear on the forums.

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