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Old 06-04-2014, 05:12 PM   #1
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what to use to "clean" transmission

ok guys, newbie to the jeep scene so I apologize if this has already been asked and answered in other posts. I am gonna change the trans fluid,as well as all the others, and was wondering if there is anything I can put in the trans to clean it before I put my oil in it. it is a 1995 with 5 speed manual behind the 4.0 engine. have read where others put straight 30 weight to clean, possibly atf. didn't know if there were good products made just for this. I am gonna use 10w 30 to refill just not sure what brand. any suggestions? have read about synchromesh? not sure what that is

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Old 06-04-2014, 05:48 PM   #2
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My personal opinion is do exactly what the manufacturer suggests, which is 75-90 gear oil. I actually like the synthetic because of it's heat and lube properties. When you pull the drain plug you may find some small dust like shavings on the plug. Just wipe it off and put it back in, fill to the drain hole, and drive it for another 100,000 miles

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Old 06-04-2014, 06:16 PM   #3
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My personal opinion is do exactly what the manufacturer suggests, which is 75-90 gear oil. I actually like the synthetic because of it's heat and lube properties. When you pull the drain plug you may find some small dust like shavings on the plug. Just wipe it off and put it back in, fill to the drain hole, and drive it for another 100,000 miles
This "was" what they recommended, they now have changed their suggestion to 10/30 weight motor oil, regular is fine. You will probably find things work much smoother with the 10/30 in it, I know mine was noticeably smoother shifting.
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Old 06-04-2014, 08:13 PM   #4
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This "was" what they recommended, they now have changed their suggestion to 10/30 weight motor oil, regular is fine. You will probably find things work much smoother with the 10/30 in it, I know mine was noticeably smoother shifting.
I'll check it out. I have my tranny out now replacing the clutch and throwing that POS internal slave in the garbage. I have drained everything so I will be replacing fluids this weekend when I put it back together.
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Old 06-04-2014, 08:42 PM   #5
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I've got to do the same thing with my internal slave, what a pos that design turned out to be.
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Old 06-05-2014, 08:04 AM   #6
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Originally Posted by MAZE51 View Post
My personal opinion is do exactly what the manufacturer suggests, which is 75-90 gear oil. I actually like the synthetic because of it's heat and lube properties. When you pull the drain plug you may find some small dust like shavings on the plug. Just wipe it off and put it back in, fill to the drain hole, and drive it for another 100,000 miles
The trans wouldn't last 100k with a GL-5 lube. That is my opinion and opinions may differ. GL-5 has a history of eating brass. Our syncros are made of brass. You can read up on it and read all the back and forth, or just go with a 10w-30 or 75w-90 NON-GL5 (like synchromesh) and call it a day.
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Old 06-05-2014, 12:22 PM   #7
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Syncromesh, redline mt-90, or 10w-30 full synthetic are what I recommend. I'm partial to mt-90 myself, a bit more expensive but the best option after a rebuild because it has better cooling properties than the other choices and it runs very smooth.

Older trannys I suggest syncromesh or 10w-30 full synthetic
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Old 06-06-2014, 10:49 AM   #8
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The trans wouldn't last 100k with a GL-5 lube. That is my opinion and opinions may differ. GL-5 has a history of eating brass. Our syncros are made of brass. You can read up on it and read all the back and forth, or just go with a 10w-30 or 75w-90 NON-GL5 (like synchromesh) and call it a day.
Yep, I agree. I have researched the internet for the last few days, and concluded, there are a ton of opinions on what to use. I have decided that the majority of opinions gravitate to Redline's MT-90. It is designed for GL-4 transmissions, which is exactly what is needed to prevent the corrosion of the brass synchros. I had no idea that the fluid in the AX5 would be such a controversy, so unlike the motor oil we put in our engines. Even the Chrysler opinions vary.

I will be putting my tranny back in tomorrow and I will see how the Redline works.
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Old 06-06-2014, 04:04 PM   #9
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thanks for the responses. still not sure what synchromesh is and no one has really addressed the idea of putting some kind of cleaning agent in before I fill with fluid. and where can I get synchromesh or mt 90? I know atf has a lot of detergents in it and didn't know if it would be a good idea to fill and run a few miles with this then drain and put in whatever fluid I am gonna use or do the fluids today have their own cleaners in them
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Old 06-06-2014, 04:28 PM   #10
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Unless you got contamination from some source (like water in the fluid) there shouldn't be a need for cleaning, it's not like a motor where combustion causes contaminants. If you feel you must clean it, add fresh fluid, run it for a couple hundred miles, drain it and add new fluid.
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Old 06-06-2014, 05:21 PM   #11
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Unless you got contamination from some source (like water in the fluid) there shouldn't be a need for cleaning, it's not like a motor where combustion causes contaminants. If you feel you must clean it, add fresh fluid, run it for a couple hundred miles, drain it and add new fluid.
x2, buy some cheap walmart 10w-30 full synthetic and run it for a 100 miles, drain it then refill it again. The ax-15 takes 3.25 quarts of fluid
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Old 06-06-2014, 07:42 PM   #12
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well its been draining for about 3 days so I am goin back with synchromesh tonite!
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Old 06-07-2014, 12:51 AM   #13
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I always like a good oil talk, LOL. What tires are best ?
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Old 06-07-2014, 12:58 AM   #14
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I always like a good oil talk, LOL. What tires are best ?
I'll answer your tire question when you explain to me why you didn't wave?!

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