Using gear oil instead of ATF for NP231 transfer case
CF Veteran
Joined: Jan 2014
Posts: 1,545
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From: District of Columbia
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
Yep. It was published by Rockland Standard Gear in 2003 on how the NP231 has a habit of evaporating ATF. This is why so many wind up running dry and eventually failing. Pages 5 & 6 of this PDF: http://www.rsgear.com/articles/2003_10.pdf
CF Veteran
Joined: Jan 2014
Posts: 1,545
Likes: 351
From: District of Columbia
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
Ah, so more like a circulation pump than what's in the AW4?
Also, the article mentions a front axle disconnect being helpful to prevent misting of the oil. I'm assuming this is the case with the NP231 since you can shift it to 2 hi and the front axle disconnects, right?
Also, the article mentions a front axle disconnect being helpful to prevent misting of the oil. I'm assuming this is the case with the NP231 since you can shift it to 2 hi and the front axle disconnects, right?
Last edited by IJM; Oct 27, 2014 at 10:41 PM.
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