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Old 08-07-2011, 11:46 PM   #1
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Transmission Fluid?

Ok so I have been researching and am completely lost as to which is best to use. I have a 95 2.5l with an AX-5.

Some people say MT90, and some people say 10w30 oil, which is also apparently recommended by chrysler........so which is the best?

Has anyone tried both and noticed a great difference?

I went into a local parts store and the directed me to some royal purple 75w90, but I'm guessing that is not quite right?

I went to check the level tonight and was greeted by a constant stream of oil pouring from the fill plug, granted the engine was still luke warm but I'm thinking it was over filled.

Anyway I want to change the fluid so whats the best way to go?

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Old 08-08-2011, 01:10 AM   #2
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You gotta remove the drain plug on the bottom and drain out as much oil as you can. Usually you want to do this while it's still relatively warm so it flows easily.

Call up your local Dodge/Jeep/Chrysler dealer and ask them what is recommended for your Jeep. They will know exactly what to use.

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Old 08-08-2011, 05:44 AM   #3
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Manual(Haynes) says Trans fluid. Auto parts store called it up for my 1990 2.5 and they recommended trans fluid. Yea, I thought gear oil at first but thats what 2 sources say and I haven't have a problem but I only have about 100 miles since the change. ( the fluid that came out of mine was definately trans fluid.)
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Old 08-08-2011, 08:35 AM   #4
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i use the Pennzoil Syncromesh and it works good. my tranny shifts so much smoother since i put it in. i think it is $8 a bottle. local car part store will carry it.
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Old 08-08-2011, 08:52 AM   #5
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x2 on syncromesh
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Old 08-08-2011, 01:04 PM   #6
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X3 on the Syncromesh! Best oil for the AX tranny.
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Old 08-08-2011, 08:36 PM   #7
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you guys are awesome, pennzoil will be the one I use. Thanks for all your responses!
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Old 08-11-2011, 10:36 AM   #8
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Penzoil synchromesh for my AX-15. Theres a pretty detailed thread on here about tranny fluids. Very informative and explains a lot.
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Old 08-11-2011, 08:38 PM   #9
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I initially used the manufacturers suggested fluid, GL-5, and it caused my transmission to grind in second and third gear. It was not smooth at all, despite being a freshly rebuilt tranny.
I switched to Pennsoil Synchromesh and it corrected all the issues I was having. It now shifts like butter. I've heard the MT-90 does well, too, but since I'm not having issues right now, I'll stick to the Synchromesh.
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Old 08-22-2011, 03:25 PM   #10
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I have an '06 Runicon that I bought used. I want to change the fluid but I have not idea what is currently in it. If I replace it with synchromesh do I need to flush the tranny or just drain and refill?
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Old 08-22-2011, 04:10 PM   #11
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I cant figure out why we are all over on this one. I own a 94 2.5/AX-5 and the MOPAR Factory Service Manual for the 94 Cherokee and Wrangler. Its says 75W90 gear oil. Who is tellling you guys to use auto trans fluid in a manual trans? Theres no faster way to kill a stick !!! I can understand the synchromesh. Its a gear oil specially designed for certain Chrysler and General Merchandise MANUAL trannys. Never, ever put automatic tranny fluid in a manual transmission. Its is way too thin and lacks the necessary friction/vicosity modifiers and will send your manual to the grave in a hurry.
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Old 08-23-2011, 07:10 AM   #12
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Syncromesh...Syncromesh...Syncromesh!
END OF STORY!
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Old 08-23-2011, 09:27 AM   #13
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whoo hooo Syncromesh.............hey, can I use Syncromesh for my transfer case too? need to change that fluid out.
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Old 08-23-2011, 11:41 AM   #14
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The tcase gets atf+4. Gear oil would be a wrong choice for it.
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Old 08-23-2011, 12:24 PM   #15
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cool. thanks for the response and sweet GTO.........
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Old 08-23-2011, 06:00 PM   #16
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Quote:
Originally Posted by kj 92yj View Post
cool. thanks for the response and sweet GTO.........
Thanks..
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Old 08-23-2011, 10:20 PM   #17
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Quote:
Originally Posted by hodge1971 View Post
I cant figure out why we are all over on this one. I own a 94 2.5/AX-5 and the MOPAR Factory Service Manual for the 94 Cherokee and Wrangler. Its says 75W90 gear oil. Who is tellling you guys to use auto trans fluid in a manual trans? Theres no faster way to kill a stick !!! I can understand the synchromesh. Its a gear oil specially designed for certain Chrysler and General Merchandise MANUAL trannys. Never, ever put automatic tranny fluid in a manual transmission. Its is way too thin and lacks the necessary friction/vicosity modifiers and will send your manual to the grave in a hurry.
Right on. You all can play "guess the fluid" with your Jeeps if you like, but I will stick with what the manufacturer recommends. Mobil 1 Synthetic 75W90 for ole "Blue"
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Old 08-24-2011, 06:10 AM   #18
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Quote:
Originally Posted by LL Cool TJ
I have an '06 Runicon that I bought used. I want to change the fluid but I have not idea what is currently in it. If I replace it with synchromesh do I need to flush the tranny or just drain and refill?
You can just drain and then refill.
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Old 04-04-2014, 07:06 PM   #19
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I have a 1990 yj, with what I'm assuming is an ax-15. The drain plug is a regular bolt, but what looks like the fill plug to me has a torx bolt that says "don't remove" right on the head of the bolt. I'm really hesitant on removing that bolt. Anyone else run into this? I can't even find the right torx bit for it. Torx 50 is too small, and torx 55 is too big. I'm stumped.
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Old 04-04-2014, 07:12 PM   #20
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Fill plug is on the passenger side don't remember the size.
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Old 04-04-2014, 08:31 PM   #21
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Yeah passenger side on my 87 and it looks like the drain plug, no torx. It's above the skid plate so hard to get to. If you can't get to it you can go through the shifter from inside the jeep.
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Old 04-07-2014, 09:44 PM   #22
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Syncromesh solved my rough shifting issues.

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