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Old 05-04-2010, 12:48 PM   #1
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Should I go ahead and change my transmission fluid?

I have a 99 Wrangler with the 4.0L and a 5 speed with around 144k miles. I changed the transmission oil in Sept of 07 with Mobil 1 10w30 (I believe that was the weight) per the dealer, when it had 127500 miles on it. Everything has been fine but lately I've been noticing that it is not as smooth as it used to be when changing gears. I've since read that Redline MTL is some good stuff to use and my question is do you think it is worth changing the oil now or is it would I be wasting my money and time? The transmission is in no way hard to shift or anything and is not acting up at all but I'm thinking that maybe after almost 3 years that fluid may be breaking down and maybe that is why the shifting is not as easy as it once was. What are you thoughts?

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Old 05-04-2010, 12:57 PM   #2
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10W 30 is motor oil

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Old 05-04-2010, 12:58 PM   #3
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It couldn't hurt though don't expect a miracle cure. I would use Redline's MT-90 which is the precise viscosity (75W-90) the specs for the AX-15 transmission call for. I forget exactly the viscosity of Redline's MTL but 70W-80 rings a bell... close enough to use without problem but why not run the exact stuff called for... MT-90. You can get it cheap and fast from Summit Racing - High Performance Car and Truck Parts l 800-230-3030
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Old 05-04-2010, 01:04 PM   #4
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Yeah I know 10w30 is motor oil . I contacted 2 dealerships before changing it and apparently Chrysler had a service bulletin released to them where they were recommending 10w30 synthetic for easier shifting so that is why I used it.
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Old 05-04-2010, 01:15 PM   #5
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There's really nothing wrong with 10W-30 synthetic in your AX-15 transmission, it is roughly equivilent in viscosity to 75W-90 gear lube. Gear lubes and engine oils have different scales for their viscosities so a 75W-90 is really no heavier than 10W-30 motor oil is.
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Old 05-04-2010, 02:34 PM   #6
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I just tossed in 80w-90. Only thing they have round these parts lol. Get the 1 gallon jug and a pump to fit it. Auto zone had it all, the jug and pump with a hose is 28 bucks or so. It is not a pump were you pump it out then put it in. This pump screws onto the top and then you just pump away.
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Old 05-04-2010, 02:35 PM   #7
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There's really nothing wrong with 10W-30 synthetic in your AX-15 transmission, it is roughly equivilent in viscosity to 75W-90 gear lube. Gear lubes and engine oils have different scales for their viscosities so a 75W-90 is really no heavier than 10W-30 motor oil is.

Ok, did not know that.
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Old 05-04-2010, 03:13 PM   #8
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I just tossed in 80w-90.
Hopefully that wasn't a GL-5 gear lube.
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Old 05-04-2010, 10:53 PM   #9
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Jerry, what will happen if you use GL-5 instead of GL-4?
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Old 05-05-2010, 05:45 PM   #10
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Jerry, what will happen if you use GL-5 instead of GL-4?
GL5 has more sulfer in it, which is supposedly bad for the brass syncros in the ax15. Problem is, it's hard to find GL3 or 4, which the ax15 calls for. I put Redline mtl in mine (GL4) and it shifts fine. Chrysler did discontinue the ax15 lube and superceded it with Mopar motor oil.
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Old 05-05-2010, 06:39 PM   #11
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SOME GL-5 gear lubes are ok in transmissions but those that are ok are very high-end GL-5 gear lubes and are usually a synthetic like from Royal Purple, Amsoil, Redline, etc.. If a GL-5 is safe to use, it will normally say something like "Safe with yellow metals" or similar on the back label. The normal run-of-the-mill GL-5 you'll find on most store shelves is high in sulphur as Pokey says, and sulphur-based additives are harsh on the synchronizers.
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Old 05-05-2010, 08:37 PM   #12
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It does say safe for yellow metals on the back . I know it was the first thing I looked for. BTW I am going to run this for a week or so until my Redline MTL comes in. This was the temp fluid until my order came in. My trans was so full of water and fluid I pulled the fill plug and it was a steady stream coming out of it. I almost filled a 5 gallon bucket half way with the fluid in the tranny lol.

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Isn't the JK just a rebodied PT Cruiser?!

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Originally Posted by coyote_94yj
Just a few more inches Red. You can take it.


If you haven't gotten more out of the insurance company than you deserve, then you haven't screwed them nearly as much as they have been screwing you for the past xx years.
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