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Old 10-18-2010, 02:05 PM   #1
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trany fluid?

Changing my fluid whats the best kind? Thanks

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Old 10-18-2010, 02:08 PM   #2
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Sorry it's a 4.0 manual 97tj

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Old 10-18-2010, 02:42 PM   #3
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This thread will open up a can and you will get lots of opinions. I use amsoil syncromesh mainly because it's the only quality tranny fluid available in my area but you can use just about anything. Some will tell you to only use dealership fluid some will say use royal purple. I say just pick one and go with it. Royal purple, amsoil, penzoil, dealership fluid, redline....really whatever is available. Some say to use oils that meet chrysler spec such as amsoil or penzoil syncro but really what is this spec? I think it's marketing but you be the judge
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Old 10-18-2010, 02:50 PM   #4
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For a 97 any quality 10/30 is what DC recommends. I use Mobil1 in mine.
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Old 10-18-2010, 04:02 PM   #5
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The AX-15 is fairly fussy about what it gets... my personal #1 recommendation is Redline MT-90 which is a full synthetic GL-4 75W-90 gear lube that exactly meets the manufacturer's spec. After that, the other Aisin recommendation is a synthetic 10W-30 motor oil. Don't be confused by the two widely varying viscosities of 75W-90 vs. 10W-30. Gear lube and motor oil viscosities are measured on two different scales with a 75W-90 gear lube being roughly equivilent to a 10W-30 motor oil.
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Old 10-18-2010, 04:47 PM   #6
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Was in a rush today so i put in the 75-90 mobil one. Wed i'll be doing the transfer case and that uses ATF4 right, is that right? Also while I'm under there should I switch out that trany fluid or will it be ok?
thanks again for the opinions
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Old 10-18-2010, 04:57 PM   #7
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Mobil-1 75W-90 GL-5 gear lube is not a good choice for the AX-15 or AX-5, long term-wise. The reason is that it uses sulphur-based additives to achieve its GL-5 rating which are very harsh on the yellow metals (like brass) used for the gear synchronizers.

SOME synthetic GL-5 gear lubes are ok for use in the AX-5/AX-15 because they achieve their GL-5 rating without the use of sulphur-based additives. Royal Purple and Amsoil being two GL-5 75W-90 gear lubes that are ok for use in the those transmissions because they achieve their GL-5 rating without the sulphur-based additives that are harmful to the gear synchronizers.

The Mobil-1 won't cause immediate harm to your synchros but it should be changed to a gear lube that isn't harsh on the synchros like the Mobil-1 is.

This is why Mopar quietly changed the 75W-90 GL-5 spec printed in early service manuals to read 75W-90 GL-3. GL-4 is a a better/updated version of GL-3 but GL-5 is a different type of lube altogether and it is definitely not a better or updated version of GL-3 or GL-4.
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Old 10-18-2010, 04:58 PM   #8
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I just use the stuff from the dealer, same stuff for tranny and transfer case and you dont have to go to any store and stare at a wall of 100 different brands and numbers.
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Old 10-18-2010, 05:00 PM   #9
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Quote:
Originally Posted by dwdrums801 View Post
I just use the stuff from the dealer, same stuff for tranny and transfer case and you dont have to go to any store and stare at a wall of 100 different brands and numbers.
It's only the same (ATF) if your transmission is an automatic. If the transmission is a manual, the lubes are different.
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Old 10-18-2010, 07:12 PM   #10
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I will replace it when I change out the tcase fluid in a few days. Thanks for the heads up Jerry, a life save as always.
As for the tcase fluid, an ATF-4 is fine or is there a certain type that I should stay away from such as the mobil for the trany?
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Old 10-18-2010, 07:15 PM   #11
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Unlike our transmissions, the TJ's transfer case is not fussy at all about the ATF it receives so long as it is good quality. Jeep only specifies a particular ATF for the transfer case to match whatever the automatic transmission requires that year. ATF+3, ATF+4, etc. is fine. ATF+4 is probably a little better choice longevity-wise but....

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