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np231 fluid swap

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Old 01-24-2012, 04:33 PM
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Default np231 fluid swap

So I just changed my t case fluid to find it had what may as well be no fluid whatsoever in it. I filled it up and it drives about the same, maybe a little smoother. What Im wondering is if the pump for the t case could have burnt out from running without fluid? I smelled the drain plug hole and it had no burnt fluid smell, and everything looked ok from what I could see. Any help appreciated, thanks
-Phil
Old 01-24-2012, 04:49 PM
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..... is this a trick question? there is no such thing as a t-case fluid pump that sits inside the t-case.... the fluid just splashes around and lubricates via contact from the chain and such
Old 01-24-2012, 05:21 PM
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Im fairly certain there is a pump that is powered by the output shaft in the 231
Old 01-24-2012, 05:29 PM
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Originally Posted by SuperGlue
Im fairly certain there is a pump that is powered by the output shaft in the 231
You are correct. That's why the Jeeps have always been popular for towing behind motorhomes. They have an oil pump in the transfer case.
Old 01-24-2012, 06:25 PM
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Originally Posted by cruiser54
You are correct. That's why the Jeeps have always been popular for towing behind motorhomes. They have an oil pump in the transfer case.
You know how low it would need to be for it to stop drawing fluid? And if running it dry would toast it?
Old 01-24-2012, 06:33 PM
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Don't know how low would be an issue.

Running it dry would toast it for sure.
Old 01-24-2012, 07:03 PM
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wow.. i'm surprised... never realized there was a pump in there.... i always thought they liked em because the 4wd was selectable... but if ya wanna buy a new pump... here's a site:

http://www.jeep4x4center.com/oil-pump-4338936.html

but for that price if your pump has failed... (i've never heard of anything related to fluid not transitioning around in the t-case ever going bad) i'd just buy another t-case from the pick n pull or Craigslist for $100 +/-
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