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Old 08-14-2008, 12:39 AM   #1
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BEST synthetic fluid for trans and tranfercase

What do u guys recommend or use????? i will be swapping mine in bout a week

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Old 08-14-2008, 06:59 AM   #2
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depends.....what year is your jeep, and is it auto or manual..4 or 6 banger?

Give us that info and we'll point you in the right direction.

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Old 08-14-2008, 08:42 AM   #3
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In my 97TJ's with 5 speeds and my 98XJ with 5 speed I run redline MT90, it is a GL3-4 rated oil that has very low levels of sulfur in it, GL5,6 rated have high levels of sulfur which eat the synchro's in the asin trannies. The redline is also a synthetic which makes it much nicer in cold weather. Either that or stick with the dealer OEM oil.
For the transfer case, I run Mobil-1 ATF in all of my NP231's and the 242 in our 97ZJ.
If a gear lube says it meets GL2,3,4,5,6 ratings, like Coastal oil sold in advanced auto, they are lying, it either has sulfur to meet the 5 and 6 ratings or it does not.
If you have an auto tranny just go with what the owners manual tells you to.
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Old 08-14-2008, 12:06 PM   #4
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04, 6 cyc, 5sp
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Old 08-14-2008, 12:39 PM   #5
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Quote:
Originally Posted by x98cobra View Post
04, 6 cyc, 5sp
For the NV3550 found in your 04...any sychromesh fluid... royal purple makes a synthetic sychromesh and so does mobil 1, pensoil, and valaline have sychromesh. I know the royal purple is full synthetic as with the mobil 1, not sure if the others are a full synthetic sychromesh.

For the t-case....I've never had a problem along with many other running Mobil 1 ATF <-- it's full synthetic.

and yes you run atf in the t-case.

the choice is yours of the product/company you want to use.
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Old 08-14-2008, 02:02 PM   #6
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for the tcase I always use atf+4 as stated in my manual. Any ATF+4... I used valvoline last time.

for my 5spd I use royal purple synchromax
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Old 08-14-2008, 02:12 PM   #7
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Royal Purple or Redline, depends on where you are in the country, you don't see Royal Purple here in the North East except at a few racing shops. Redline however has been showing up at most parts stores in the last couple of years. I got into a discussion with the manager at our local AA, now he stocks MT90 and it sells.
The only shop I know that sells RP is down in Dover/Rockaway NJ on Rt 46, they have the entire line of RP and Redline in stock.
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Old 08-14-2008, 03:41 PM   #8
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What about for a 97' 4cyl 5spd
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Old 08-14-2008, 04:07 PM   #9
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Quote:
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What about for a 97' 4cyl 5spd
Thats easy, GL3/4 Redline MT-90, it won't eat the bronze synchros in the tranny. Use a gl5/6 and it will start popping out of gear on you as the synchros wear. It's easy to spot when someone uses it too, the oil comes out a nice golden color, more golden then new.
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Old 08-14-2008, 08:42 PM   #10
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Redline MT-90 is what I run in the Tranny and Mobile 1 ATF in the XFer Case.
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Old 08-14-2008, 09:39 PM   #11
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MT 90 is great i run it. In the AX-15


ORIGANAL poster, You have the NV3550 5speed transmission. Yours requires synchromesh unlike the AX-15 found in 99 and older tj's.

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