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  #1  
Old February 16th, 2021, 17:23
ljobbins ljobbins is offline
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Np231 no oil pump

I got ahold of a used np231 that looked like it has never been opened. When I opened it up for an sye install there was no oil pump. Did any years come without an oil pump or did the previous owner remove it? Do I need to go find a junkyard one or buy a new one or is anybody running without a pump?


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  #2  
Old February 16th, 2021, 17:32
RCP Phx RCP Phx is offline
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Re: Np231 no oil pump

Well you can't run without the pump!
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Old February 17th, 2021, 10:08
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Rob Mayercik Rob Mayercik is offline
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Re: Np231 no oil pump

That strikes me as a pretty odd piece to be missing from a tcase.

Have you checked the internals against a known correct parts diagram/manual to confirm you're seeing this correctly? (no insult intended, sometimes it's good to make sure you haven't missed one of the "is it plugged in?" type answers)
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Old February 17th, 2021, 17:26
ljobbins ljobbins is offline
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Np231 no oil pump

Just a nice hole. No pump or tube or indication of anything. The areas that the pump sits in were completely filled with rtv. All the fluid looked clean and nice. The gears and chain everything are clean and no abnormal wear. The magnet didnít have anything out of the ordinary.





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Old February 17th, 2021, 17:29
ljobbins ljobbins is offline
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Np231 no oil pump

On another note, I am having a hard time finding the tube for the pump. A lot of people make or sell replacement pumps for the np231 but I am struggling to find a tube or a pump/tube combo. I can go ask the transmission shops around me but it just seems weird that the tube isnít super to find. Or maybe I just suck at google.


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Old February 18th, 2021, 10:40
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Rob Mayercik Rob Mayercik is offline
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Re: Np231 no oil pump

Hm. What about reaching out to NP/NV, or maybe a Jeep dealer? They're still putting these cases in new vehicles...
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Old February 18th, 2021, 11:13
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Re: Np231 no oil pump

NP231 are not made of unobtanium, I would stop by the junkyard and grab a good used one. The local U-Pull-It charges $99 for a t-case. If you have no idea how long it was run with no oil pump, it is suspect anyways, and I would definitely replace it.
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Old February 18th, 2021, 11:46
RCP Phx RCP Phx is offline
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Re: Np231 no oil pump

Assuming your trying to save time, but why not use your TC since you know more about it. Do you even know if it fits your XJ?
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