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Old 12-21-2010, 04:41 AM   #1
Join Date: Sep 2010
Posts: 18
Transfer case fluid

95 wrangler 2.5 manual transmission.

I am performing a drain and fill on the transmission and the transfer case tomorrow.
Im using 75W-90 (80W-90 actually) in both the transmission and the transfer case.

I have read numerous posts recommending ATF exclusively in the transfer case.

My Chilton manual reads: "Use the same viscosity oil as in the transmission".
But.. the next paragraph reads:
"Remove the fill plug, then fill the transfer case (both the NP-207 and the NP-231 use dexron II transmission fluid.")
Chiltons manual sort of contradicts its self.

Since my transmission requires 75W-90...thats what I plan on using in the transfer case.

If anyone has other recommendations, please let me know.

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Old 12-21-2010, 07:33 AM   #2
Join Date: Dec 2010
Posts: 14
You want regular good ol' ATF in your transfer case. Don't go by what Chilton's says.

Additionally, Jeep has updated their fluid recommendations. Both the AX-5 and AX-15 now call for 10W-30 for the transmission. Regular dino oil will be fine.

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Old 12-21-2010, 08:06 AM   #3
Join Date: Dec 2010
Posts: 36
run 10w30 in the transmission, wow Ive never heard of that. Im glad I read this post about this.
wild is offline   Quote
Old 12-21-2010, 10:39 AM   #4
Join Date: Nov 2010
Posts: 67
They took an idea from Honda with the 10/30,10/40 oil recommendation
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Old 12-21-2010, 12:20 PM   #5
hannahuffster's Avatar
Join Date: Mar 2010
Location: Joplin, MO
Posts: 402
You actually can run about any lightweight oil in ether the trans or transfer case. The heavier (like gear oils) the oil the worse it is for both. I like ATF, but I also change mine 4-5 times a year because I am in a lot of mud and creek crossings almost every week...
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Old 12-21-2010, 12:45 PM   #6
Join Date: Sep 2010
Posts: 18
Ok thanks,
I returned the 80W-90 gear oil.

Went to W-mart.
I purchased Super Tech full synthetic 10W-30 oil for the transmission.
The 1 gal container reads "API service SN, SM, SL, ILSAC GF-5 and GF-4.
I believe that 80W-90 gear oil is GF-5.
The main difference that I have learned since my original post is that
Gear Oil (GF-5) is corrosive to brass or is unfriendly to yellow metal..the AX5 and AX15 trnasmission syncro gears are brass.
Manual transmission = 10w-30

For the transfer case I purchased Super Tech ATF
ATF label reads "suitable for use in vehicles requiring Dexron II, Dexron III and Mercon fluids."

Bought a Fluid Pump at Harbour Freight to make the fill job easy.


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