Np231 no oil pump

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ljobbins

NAXJA Forum User

NAXJA Member

Location

SD County

• Feb 17, 2021

• #1

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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RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Feb 17, 2021

• #2

Well you can't run without the pump!

 

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Rob Mayercik

NAXJA Member #920

NAXJA Member

Location

NJ, U.S.A.

• Feb 17, 2021

• #3

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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ljobbins

NAXJA Forum User

NAXJA Member

Location

SD County

• Feb 18, 2021

• #4

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 didn’t have anything out of the ordinary.

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ljobbins

NAXJA Forum User

NAXJA Member

Location

SD County

• Feb 18, 2021

• #5

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 isn’t super to find. Or maybe I just suck at google.


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Rob Mayercik

NAXJA Member #920

NAXJA Member

Location

NJ, U.S.A.

• Feb 18, 2021

• #6

Hm. What about reaching out to NP/NV, or maybe a Jeep dealer? They're still putting these cases in new vehicles...

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• Feb 18, 2021

• #7

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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RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Feb 18, 2021

• #8

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?