NP231 Transfer Case, AX-15, 75W-90, and Dexron II

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Jul 5, 2011 | 02:27 PM

94JeepCherokeeMan

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Joined: Jun 2011

Posts: 1,023

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From: Southern Idaho

Year: 1994

Model: Cherokee

Engine: 4.0 L/242 CID I-6 High Output MFI

NP231 Transfer Case, AX-15, 75W-90, and Dexron II

I'm going to change the fluid in my tranny and transfer case soon. The FSM calls for 2.2 pints of Dexron II for the TC and 6.75 pints of 75W-90 for the transmission. Can I use Dexron 3 or higher with no ill effects? Also, should I use the $5/qt. gear oil or go with the Mobil 1 synthetic? The jeep is my daily driver and goes 450 miles nonstop 8 times per year.

Rob

Jul 5, 2011 | 03:01 PM

93gc40

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Joined: Mar 2009

Posts: 2,750

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From: Visalia, Kalifornia, ussa

Year: 1996

Model: Cherokee

Engine: 4.0

Use dex 2 or 3 or 4... I'd use gear oil in the rear end with changes at proper intervals. Personally I would NOT switch to Synthetic in an older high mileage vehicle, more potential for issue than real benifts.

Jul 5, 2011 | 03:08 PM

Bustedback

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Joined: Feb 2010

Posts: 12,367

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From: Oroville, CA

Year: 1995

Model: Grand Cherokee

Engine: 4.0 with all of the noise and clatter

Does not really matter what ATF you use in the transfercase. Your choice if you want to run synthetic gear oil, it may help keep the transmission a little cooler, but I've never had a problem with plain ol' 75w90 gear oil.