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Old 08-23-2010, 10:05 PM   #1
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I found this interesting about the tranny fluid..

Ive only owned my 91 YJ for about a month now and not knowing what the previous owner had done latley i desided to change my tranny fluid.. I called 5 different Jeep dealerships to ask what type of fluid my jeep needed. To my amazment i actually got 5 completly differnt awnsers. I was told GL-3, GL-5, ATF+4, 10w30, and 10w40.. I was blown away after alot more calls and research i put Lucas 75w90 in it. Still not sure if i need to change it to 10w30 but so far im not having any problems. But the point is 5 different Jeep DEALERSHIPS had no clue what the right fluid should be after imputting my VIN # into there system.
Thought this was interesting..

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Old 08-23-2010, 10:29 PM   #2
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amsoil, Automatic transmission fluid. put in auto or manual. makes your shifting feel amazing!

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Old 08-23-2010, 11:05 PM   #3
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I heard redline mt90....apparently anything but water seems to be ok. lol.
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Old 08-23-2010, 11:18 PM   #4
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"Recommended lubricant for the AX15 and AX4/5 Transmission is SAE 75W-90, API Grade GL-5 gear lubricant."
This is quoted directly from the 1991 Chrysler factory service manual. (The Bible)
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Old 08-24-2010, 12:01 AM   #5
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Thank you Wrangler Haven.

I got nearly laughed out the room for recommending the exact same thing 3 months ago at a Jeep club meeting.

It's Black n' White from the Friking Manual?!?

If I'm missing something, feel free to point it out?
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Old 08-24-2010, 06:42 AM   #6
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Here is something interesting for you to research aswell..I copied it from a session with the jeep engineers.
Quote:
Originally Posted by JeepEngineers
We can only recommend the correct lubricant as found in your owners manual or service literature, so we can't speak to the use of alternate lubricants. In terms of the synchros, there again, all we would be able to suggest are the O.E. parts, assuming they are are still available from your dealer...if the aftermarket has come up with different materials, we wouldn't necessarily be aware of that or be able to recommend them.

Quote:
Originally Posted by JeeperDon
How about a rephrase? What do dealer service shops put in the AX5/15 of a YJ when it is in for service and needs fluid? I do not believe there is a GL-4 Mopar fluid available.

Like JeeperDon, I would like some clarification on that point.

Here is what I use, and the advice I give others here on the forum (actually copied from a previous post of mine), it's based on my own research and I would like to know if it's accurate information.

Here's why I use 10W-30 motor oil.

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.

http://www.trademotion.com/partlocat...&siteid=214996
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Old 08-24-2010, 09:12 AM   #7
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Yea Mopar make a sae 10w30 fluid just for your tranny, after going to countless part shops and reading many fourms i went with 75w90. It was the most common awnser i got from everyone including three local tranny shops. I also had called 1800-iam-jeep. Who couldnt awnser the question and never called me back like they said they would with an awnser..
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Old 08-24-2010, 07:24 PM   #8
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I don't care who superceded what # to what. The Factory Service Manual lists the Tranny fluid as SAE 75W-90, API Grade GL-5 by the friggen people that designed and BUILT the Transmission. You could probably put cat piss in there and it would be just fine too.
For awhile.
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Old 08-25-2010, 01:49 PM   #9
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it is either Plus 3 atf fluid, or atf type 7176.
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Old 08-25-2010, 02:25 PM   #10
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i have been running mine with cheap 10w30 motor oil since march and wheel the piss out of it on a regular basis aswell as DD and have seen an improvement over the gear oil that was in it.. I have several ppl I trail ride with and they have been running the same thing in theirs for over 6 years and never once has a tranny gone out on them.
If you are speaking from something you read online and not from personel experience then I guess you can't believe everything you read, especially online.
I would gladly put my tranny and motor oil behind you and go anywhere as long as you do and garuntee 2 weeks pay that it will be in as good of condition as it was at the starting point//
I am not looking for a pissing match but unless you can provide me with credible proof from a tranny going bad from motor oil that would not have gone bad in the same situation with gear oil then I will conceed your answer...
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Old 08-25-2010, 03:25 PM   #11
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Quote:
Originally Posted by UABYJ94 View Post
i have been running mine with cheap 10w30 motor oil since march and wheel the piss out of it on a regular basis aswell as DD and have seen an improvement over the gear oil that was in it.. I have several ppl I trail ride with and they have been running the same thing in theirs for over 6 years and never once has a tranny gone out on them.
If you are speaking from something you read online and not from personel experience then I guess you can't believe everything you read, especially online.
I would gladly put my tranny and motor oil behind you and go anywhere as long as you do and garuntee 2 weeks pay that it will be in as good of condition as it was at the starting point//
I am not looking for a pissing match but unless you can provide me with credible proof from a tranny going bad from motor oil that would not have gone bad in the same situation with gear oil then I will conceed your answer...
i'm interested in this as well, I've done extensive personal research into what tranny fluid should be used here is what I've come up with...

first thing I looked at is what is the difference between 75w90 and 10w30,

basically they are very similar except for viscosity under pressure:

TYPICAL TECHNICAL PROPERTIES

Synthetic Manual Transmission and
Transaxle Gear Lube 75W-90 API GL-4 (MTG)


Kinematic Viscosity @ 100C, cSt (ASTM D-445)
14.7
Kinematic Viscosity @ 40C, cst (ASTM D-445)
84.5
Viscosity Index (ASTM D-2270)
181
Flash Point, C (F) (ASTM D-92) 150C Min.
204 (399)
Pour Point, C (F) (ASTM D-97)
-46 (-51)
4-Ball Wear 75C, 1200 rpm, 40kg, 1 hr.
0.45mm
Brookfield Viscosity @ -40C
44,200
Foam Stability (ASTM D-892) (20/50/20)
0/0/0
Copper Corrosion (3 hr, 121C) (ASTM D-130)
1B

versus


Mobil 1 10W-30
SAE Grade 10W-30


Viscosity, ASTM D 445
cSt @ 40 C 62
cSt @ 100 C 10.0
Viscosity Index, ASTM D 2270 147
Sulfated Ash, wt%, ASTM D 874 1.0
HTHS Viscosity, mPas @ 150C ASTM D 4683 3.14
Pour Point, C, ASTM D 97 -45
Flash Point, C, ASTM D 92 224
Density @15 C kg/l, ASTM D 4052 0.86

if you compare them against each other you see...

"75W90 gear oil is actually of equivalent viscosity to a 10W40"

Quote:
API GL-4, oils for various conditions - light to heavy. They contain up to 4.0% effective antiscuffing additives. Designed for bevel and hypoid gears which have small displacement of axes, the gearboxes of trucks, and axle units. Recommended for non-synchronized gearboxes of US trucks, tractors and buses and for main and other gears of all vehicles. These oils are basic for synchronized gearboxes, especially in Europe.
Quote:
Gear oil is a motor oil made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. It is of a higher viscosity to better protect the gears and usually is associated with a strong sulfur smell. The high viscosity ensures transfer of lubricant throughout the gear train. This is necessary since the devices needing this heavy oil do not have pumps for transferring the oil with only a portion of the lowermost gears bathed in an oil sump.
either way, the book says to use 75w90 as it is specifically designed as gear oil for diffs and trannys. 10w30 might work, but 75w90 is designed for a gearbox when there isn't an active system to move the oil around the moving components.

http://www.mobiloil.com/usa-english/..._1_10w-30.aspx
http://www.mobil.com/USA-English/Lub..._1_10W-30.aspx
http://www.amsoil.com/storefront/mtg.aspx
google for everything else
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Old 08-25-2010, 03:31 PM   #12
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but this brings us back to the question of using gl-5 or gl-4
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Old 08-25-2010, 03:54 PM   #13
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I have read those figures before aswell and agree the 10w40 is closer but the difference is not enough to spend the extra bones on gear oil when I get the same result from motor oil without any consequences. I know and agree that the factory calls for gear oil and most people use it. That was never my disagreement. It was with the fact of someone saying it will not work or last when it has already been proven time and time again that it does and will last..
It's all about personel preference.. this is one of soooo many things we all choose our own path on, but that does not give anyone a rite to bash another for their chose that works for them without harm..
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Old 08-25-2010, 05:53 PM   #14
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No one's bashing anybody here. We're just having a discussion. If you choose to run motor oil in a gearbox, that's your God given right. It's your rig and you can do whatever you want. It'll probably be fine and may even shift smoother. Keep in mind though that they may have superceded that part number just to cut cost.
These Transmissions all came with 75W-90, Grade GL-5 from the factory. It works. Why take a chance on something else?
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Old 08-25-2010, 08:05 PM   #15
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I completely understand what you are saying WH, but if we kept everything the same as when it came factory,because it worked, then there would be no modified jeeps on the road. Everything someone is using on their jeep or even in there jeep that wasn't an oem part on it when it sold off the lot is being made and used by others because someone before them had the light bulb above the head thinking hmmmm I wonder?????
So many ppl are afraid of something new or different because it's out of their box, but it doesn't neccesarily make it a bad change.
Because my jeep came factory with 5w30 grade does that mean my engine is going to quit because I changed that grade too?
If it has been proven to work and not be detrimental to our jeep what makes it wrong?
We change most every part of our jeep compared to the way it came from the factory in almost every other sense of the word and I dont se these as different as apples and oranges either.
I did alot of research myself after hearing about it the first time because I thought the samething as you,, "This has got to be the dumbest idea anybody could ever think up,,hummmmfh,, putting engine oil in my tranny,,what an idiot..."
After doing research for several days and seeing so many pros and not the first con,,other than hear say, I decided I would try it for 1 month then drain it and see what it looked like. Well, after feeling the difference in my shifting and how smooth it ran without any kinda leaks like I expected, I put it back in.
The real test was after wheeling it thru some trails with mild mud and a couple water crossing up to bottom of my doors. I drained it the next day and i was pleasantly surprised to see how well it looked.
I give you m word that while I'm on this forum I will do my very best not to ententionally give advise on matters I wouldn't put my own jeep thru..
I don't give advise based on hear say. I do research most of the day with my free time.
I'm sorda anal about hearing someone having issues I haven't experienced in my jeep or any of my vehicles for that matter and automatically go into search and learn mode..lol
Hope this gives all who reads this some insight as to the type of person I am..
I will gladly admit when I have made a mistake and find out myself or has been shown the error of my thinking and advice..
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Old 08-26-2010, 10:35 AM   #16
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Man i didnt mean for this to turn into any kind of discusion. I got wanted to inform other owners that just because a Jeep dealership is what i would have thought was a good source for info on my Jeep doesnt mean they have any clue as to what they are saying. Yall do have alot of good info in the subject though.
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Old 08-26-2010, 11:06 AM   #17
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this is healthy discussion,nothing for hating on..lol
I wish no ill will on anybody who has passion for what they believe.
I always try to keep an open mind on new ideas and if someone can prove there is a cheaper and just as effective way of doing something, then I will by all means give it a try.
That is what all forums were designed to do ,,let ppl put their ideas and successes and failures out here to help others coming up behind them.
The whole point of being an enthusiate is to be passionate about what you are doing.
To help aid in knowledge or repair of the very thing you love, whether it be yours or you fellow man/woman.
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Old 08-26-2010, 01:13 PM   #18
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OK not to continuely bash on dealerships but you really need to hear the shit thats going on now...
I dropped my jeep of at the local dealership this morning to have five recalls fixed. I got a call about 10:30. They drove me Jeep into the shop replaced one of the recalls went to move it to another stall and it wont start. I hooped in my dads truck and went down there. They wanted $120 dollars to run a diagnostic test luckly for me the tec went to lunch and left the diagnostic unit plugged in my Jeep i ran a couple quick tests while no one was looking didnt come back with any codes... They said there is no pressure in the fuel lines so im bout 100% its the fuel pump. The want $277 for labor and me to bring the $90 pump. So a total of $367. They wont come of that at all they say even though it happened in there possesion they arent at fault. I was so pissed i couldnt see strait.
F*** a dealership when they finish with the recalls im gonna tow it to my mechanic..
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Old 08-26-2010, 01:50 PM   #19
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If the recall they were working on first was the e-brake recall then tell there dumba$$ to hook the fuel pumps ground wire back up to the mounting bolt of the e-brake or to the tub somewhere..
THere are posts all over the net where ppl take there jeep in for the e-brake recall and the idiots didnt hook the ground wire back up...
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Old 08-26-2010, 02:33 PM   #20
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Originally Posted by UABYJ94 View Post
I have read those figures before aswell and agree the 10w40 is closer but the difference is not enough to spend the extra bones on gear oil when I get the same result from motor oil without any consequences. I know and agree that the factory calls for gear oil and most people use it. That was never my disagreement. It was with the fact of someone saying it will not work or last when it has already been proven time and time again that it does and will last..
It's all about personel preference.. this is one of soooo many things we all choose our own path on, but that does not give anyone a rite to bash another for their chose that works for them without harm..
I hear you man on the fact that it is working for you. Thats great and awesome. It is definitely a plus that you are letting people know your mod. But you probably want to preface your advice by letting people know what the factory says to use and then what you actually use that way people can make an informed decision. What you are doing is working fine, just make sure they understand its not what the book says.

PS no one is bashing you
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Old 08-26-2010, 03:19 PM   #21
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You are right I should let people know,, I guess it wsa an assumption on my part that people would kno gear oil for standard is by the book.
I didn't mean for it sound as strong as it came out about being bashed..sorry for that one..
I guess those who aren't acustomed to working or even changing their own fluids would think because an auto takes atf that they could just as easily stick in a standard.
Point taken very well.
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Old 08-26-2010, 05:39 PM   #22
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Man i am going so pissed if thats the problem. Unfortunalty is locked up in a buddys shop for the night, but yea thats what they replaced then it wouldnt start..
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Old 08-27-2010, 09:42 AM   #23
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Well go figure it was that ground wire.. I connected it and fired right up..
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Old 08-27-2010, 10:32 AM   #24
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Now don't tell me the dealership made an error,,,,
I mean they are ASE certified and went thru extensive training to work on our vehicles that were built by the very company that sent out the recalls....
You don't suppose that the mechanic missed the memo on putting everything back that they took loose when repairing the recalled item do you....
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Old 08-27-2010, 10:43 AM   #25
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Been down this road before. It took me two days after that recall, to figure out that they forgot to hook my wire back up. I went storming back in there and told the service manager that he had a bunch of monkeys working in there.
How hard can it be? If you unplug it, PLUG IT BACK IN!!
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Old 08-27-2010, 12:37 PM   #26
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Originally Posted by UABYJ94 View Post
Now don't tell me the dealership made an error,,,,
I mean they are ASE certified and went thru extensive training to work on our vehicles that were built by the very company that sent out the recalls....
You don't suppose that the mechanic missed the memo on putting everything back that they took loose when repairing the recalled item do you....
yea seriously, ALL OBEY THE STEALERSHIP
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Old 08-28-2010, 08:29 PM   #27
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also UABYJ94 i was rereading some of my posts and I realized I was kinda bashing your way of doing things, so my apologies, life goes on true
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Old 08-28-2010, 10:12 PM   #28
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It's all good my fellow jeeper.. Don't sweat it at all..
I didn't take it the sense of bashing that my typed response made it sound..
Peace to you and happy tails ahead..
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Old 12-30-2010, 03:20 PM   #29
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stay away from from GL-5, it contains sulfur compounds that will corrode the brass synchros in your tranny.
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Old 12-30-2010, 04:53 PM   #30
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Originally Posted by Wrangler Haven View Post
I don't care who superceded what # to what. The Factory Service Manual lists the Tranny fluid as SAE 75W-90, API Grade GL-5 by the friggen people that designed and BUILT the Transmission. You could probably put cat piss in there and it would be just fine too.
For awhile.
+1, WTF.....follow the freekin manual!!!!

Already been like 6 separate threads on this subject

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