91' AX-15 Trans. Lube Substitutions? - JeepForum.com

 
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post #1 of 10 Old 03-13-2010, 10:01 AM Thread Starter
JUnit91
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91' AX-15 Trans. Lube Substitutions?

Has anyone heard of using 15w40 motor oil instead of 75w90, or 80W90 gear oil for transmission lube?

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post #2 of 10 Old 03-13-2010, 10:08 AM
Mean Max
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Conventional 10w-30 is the new spec for the AX-15. I use the cheap stuff from Wal-Mart.

Here's why I use 10W-30 motor oil in my AX-15.

The Mopar gear oil part number used to be 4897622aa, but when you search that part number you'll see it has been superceded by part number 4761839AC which comes up as 10w-30 motor oil. Here's a link to search the Mopar part numbers.

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It's the "new factory spec" lubricant.

Based on that, I use 10w-30 motor oil. I buy the Wal-Mart "Super Tech" store brand oil because it's cheap, meets all the API (American Petroleum Institute) grade qualifications and I change mine often, at least every 6 to 12 months.

Here's a link to the Jeep Engineers Q&A thread here on JF where I questioned the Jeep factory engineers on this very thing.

Here's my question post....
http://www.jeepforum.com/forum/f144/...ml#post8016389

And here's their reply.
http://www.jeepforum.com/forum/f144/...ml#post8016473

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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.

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post #3 of 10 Old 03-13-2010, 10:27 AM Thread Starter
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I assume 15W40 would work too, right?
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post #4 of 10 Old 03-13-2010, 10:43 AM
Mean Max
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I can't imagine that it would make that much difference.

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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.

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post #5 of 10 Old 03-13-2010, 10:54 AM Thread Starter
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Thanks. I thought I read that somewhere. It was probably here!
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post #6 of 10 Old 03-13-2010, 11:36 AM
DaveinHouston
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I use 10W30 Mobil 1 in my AX15. It made a noticeable difference. The tranny shifts much smoother.

- 2003 Rubicon - 4" Lift, 35" KM2s, 5.13 gears, winch
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post #7 of 10 Old 03-13-2010, 04:57 PM Thread Starter
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Does your tranny make any strange noises when it gets hot with the 10w30 in it? I'm going to request they put that in at my shop after the rebuild....I know they're going to look at me like I have ten heads!
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post #8 of 10 Old 03-13-2010, 05:52 PM
DaveinHouston
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No funny noises with mine but I don't think the fluid would either make or eliminate noises. From what I've read Jeep now recommends using 10W30 engine oil in the tranny but I can't swear to it. I've read it a couple of places. I changed my own out so no worries about telling someone what to put in it.

- 2003 Rubicon - 4" Lift, 35" KM2s, 5.13 gears, winch
- 1968 CJ5 - Dauntless V6, T-86, Dana 18, D27 & D44

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post #9 of 10 Old 03-14-2010, 09:05 AM Thread Starter
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I just drained the 75w90 gear oil out of my trans., and filled it with Mobil 5000 10w30. I drove it around the block and it seems to shift well! I hope it lasts. I haven't had a chance to get it hot yet.
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post #10 of 10 Old 04-01-2010, 06:34 PM Thread Starter
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I too did some homework on the subject! I contacted my local dealer and they said 10w30 semi-synthetic is the new spec for the AX-15. I put 10w30 in mine, and it did shift nicely. I thought it shifted too nicely, almost "light duty-ish". I'm now using 20w30, and it works very well for me. It has more of a heavier duty cushion feel.
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