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Unread 08-24-2011, 11:52 AM   #1
02grandy
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5 speed transmission fluid question

i have a 92 wrangler 2.5l with a 5 speed it looks like it takes 75/90w from the book but can i use 80w/90??? and does gear oil go bad? ive had an open bottle almost full for about 5 years maybe more . is it still good? thanks. im using it to top off from replacing the reverse switch.

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Unread 08-24-2011, 11:57 AM   #2
TheNewbie
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The new spec for the AX-5 (the 5 speed behind the 2.5 in your 92) is plain old 10W30 motor oil.
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Unread 08-24-2011, 12:02 PM   #3
02grandy
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i kinda want to get rid of this bottle lol i dont know whats in there smells like gear oil. but if he has regular oil can you mix and can i still use 80w over 75
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Unread 08-24-2011, 12:14 PM   #4
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Quote:
Originally Posted by 02grandy View Post
i kinda want to get rid of this bottle lol i dont know whats in there smells like gear oil. but if he has regular oil can you mix and can i still use 80w over 75
That I don't know. I know you can mix engine oils. Like mixing a 10W30 and a 10W40 to get 10W35. But I don't know about gear oils. I would assume it's just a thicker version of the oil used for engines and could be mixed. But IDK for sure.
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Unread 08-24-2011, 01:17 PM   #5
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I am swapping mine to 10w30 this weekend.
Hopefully it will smooth the shifting a little bit.
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Unread 08-24-2011, 01:27 PM   #6
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I am swapping mine to 10w30 this weekend.
Hopefully it will smooth the shifting a little bit.
It smotthed mine out. I swapped to 10W30 from whatever was in there from the PO (probably the origional fluid) and it went from feeling kind of "toothy" to shifting like butter.
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Unread 08-24-2011, 02:39 PM   #7
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Well, mine is about 4 years old. I had it changed just shortly after I got my YJ.
Of course they probably filled it full of 75/90w

Mostly I am changing it because about a month ago I went to Mr. Lube, and declined then when they wanted to change my trans oil. Now suddenly my trans is whining. This is the third time I have had a problem right after seeing them. I will not be going back again.
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Unread 08-24-2011, 02:45 PM   #8
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10w-30...doesnt matter what brand, did wonders for mine....
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Unread 08-24-2011, 03:57 PM   #9
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i didnt have the star socket to open the side and couldnt find anything else so i took the shifter off and fill it like that to what came out when i replaced the reverse light switch. i use 80-90 i had around since i think thats what was in there from the smell and thickness. i had the cover off from a clutch job so it was easy
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Unread 08-24-2011, 04:07 PM   #10
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Quote:
Originally Posted by TheRobster View Post
I am swapping mine to 10w30 this weekend.
Hopefully it will smooth the shifting a little bit.
made mine shift worse, its harder now.... going back to gear oil...
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Unread 08-24-2011, 05:11 PM   #11
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Originally Posted by PA_YJ19 View Post
10w-30...doesnt matter what brand, did wonders for mine....
I will be finding out in the next few days.
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Unread 08-24-2011, 08:15 PM   #12
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Originally Posted by TheNewbie View Post
That I don't know. I know you can mix engine oils. Like mixing a 10W30 and a 10W40 to get 10W35. But I don't know about gear oils. I would assume it's just a thicker version of the oil used for engines and could be mixed. But IDK for sure.
Respectfully disagree. If you mix one quart of 10W-30 with one quart of 10W-40, then you have one quart of oil that behaves like 10W-30 and another that behaves like 10W-40. This is not the same as oil blended to be 10W-35 from the get-go.
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Unread 08-24-2011, 08:53 PM   #13
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If you use gear oil, make sure it is not the kind that messes up the brass syncho gears. Search, there are threads on it.
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Unread 08-25-2011, 06:24 AM   #14
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Originally Posted by TheNewbie View Post
The new spec for the AX-5 (the 5 speed behind the 2.5 in your 92) is plain old 10W30 motor oil.
do I also have an AX-5 in my '91 YJ with 4.0L I6?
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Unread 08-25-2011, 08:00 AM   #15
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Originally Posted by hrt4me View Post
do I also have an AX-5 in my '91 YJ with 4.0L I6?
That would be an ax-15. Same 10w30 spec on oil.

I changed mine out and it was terrible! Then I removed the t-case drop and suddenly the tranny shifts like butter. I suppose you have to make sure the transmission is able to use whichever oil you choose to run.
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