Question about 1990 Jeep Wrangler

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What type of oil does the transfer case use, 1990 jeep wrangler 231j

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Dextron III or mercon atf. (I use lucas trans conditioner additive to give a bit more protection, and have had no problems, but it's a non factory item)

Posted on Sep 08, 2009

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Posted on Jan 02, 2017

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What type of fluids are used in a 2000 Jeep Wrangler sport 4.0 in-line 6 automatic


go on line to jeep wrangler fluid capacities and specs and down load the information.

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What type of oil should be used with a 1990 Jeep Wrangler 4-Cylinder? Would SAE 10W-30 be okay?


Oil is always a somewhat controversial topic.So many people have so many different opinions of brands of oil, blends and weights to run. Personally, I dont deviate to much from the factory recommendations in my car. My logic is they have tested the cars durability with the oil and would have stood behind warranty claims in the earlier years of the cars life. That being said, 5w-20 is the latest recommended oil.

That aside the history of oil for the jeeps originally started with recommending 10w 30 to 5w 30 to 5w 20.

Good luck.

May 26, 2011 | 1990 Jeep Wrangler

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1990 Jeep Wrangler, 2.5L 4WD isn't working. I've checked the gear oil and it's fine.


If the external linkage is attached and working it pretty much has to work unless it has an internal failure. (Usually pretty noisy when that happens)
Many times I've seen a differential failure be mistaken for a transfer case problem. disconnect the driveshaft from the front diff and see if you can turn the yoke with the vehicle on the ground. If you can, you should remove the cover and take a look at the gears. Also, if there is a control unit on the passenger front axle, make sure that is working as well.

Jun 11, 2010 | 1990 Jeep Wrangler

1 Answer

HOW DO YOU PUT 1990 JEEP WRANGLER IN 4WD? IT IS A MANUAL TRANSMISSION WITHOUT LOCKING HUBS. IT MOVES WHETHER IN NUETRAL OR 2WH. IS THAT NORMAL? I CAN'T TELL IF IT IS IN 4WD.


i had that problem to. count the number of "clicks" when putting it into different gears. make sure that the shifter does not go side to side while driving...that can cause damage. its an older truck things let go. i have to re-do the seals on my transfer case cause i was driving my jeep inbetween 2H and N and she got hot and poped them.

Feb 06, 2010 | 1990 Jeep Wrangler

1 Answer

1990 jeep yj 4 wheel drive issues


what are you trying to say is that the front wheels wont engage?? if this is your problem? check the actuater on the passenger side axle there are 3 lines that go to it and that is what pulls it in and pushes it out of gear by air.

Oct 06, 2009 | 1990 Jeep Wrangler

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JEEP oil leak


your oils sending unit is leaking the part is not expensive,

Jun 29, 2009 | 1990 Jeep Wrangler

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2000 jeep wrangler are sythetic lubes used in axils and trans


Hello grega1967, your Jeep Wrangler came from the factory with gear oil in the axles and manual transmission, but the transfer case uses transmission fluid. It is a NP231 and your axles are Dana 30 in the front and Dana 35 in the rear. They should have a 4.10 gear ratio due to you having a 2.5 liter 4 cylinder.

I hope this helps,

map6260

Mar 12, 2009 | 2000 Jeep Wrangler

1 Answer

AUTOMATIC TRANSMISION


there is an oil seal between the transfer case and trasnmission housing, if your bearings have gotten hot in the transfer case, this could have caused the oil to heat up and damage the mechanical seal

Jul 21, 2008 | 1998 Jeep Wrangler

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