Oil pressure/transmission noises - JeepForum.com
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post #1 of 3 Old 08-26-2013, 08:41 AM Thread Starter
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1998 XJ Cherokee 
Join Date: Jul 2009
Location: Northern
Posts: 142
Oil pressure/transmission noises

I've got a 98 XJ 4.0. Runs and drives absolutely beautifully, with the exception of a few problems.

First, the oil pressure gauge is kind of wonky. If I hard accelerate to pass a vehicle, the gauge will actually go backwards toward 10-15 PSI and then back to 40 after I let off the gas. Sometimes, the gauge will always read at 40-50, or just slightly below 40 depending on idle speed.

I just replaced the sending unit in January. Possibly a defective one? It's from Auto Zone or Advance (Can't remember).

Also, and this has been this way for as long as I have owned it, on downshift when slowing down, there sometimes is a noticeable CLUNK when the Jeep shifts into 1st gear. Sometimes, it clunks the same way when taking off from a stop light or stop sign.

Transmission mount?

Aside from that, it's a super truck and couldn't be happier with it.

vjz is offline  
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post #2 of 3 Old 08-28-2013, 09:24 AM Thread Starter
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1998 XJ Cherokee 
Join Date: Jul 2009
Location: Northern
Posts: 142
vjz is offline  
post #3 of 3 Old 08-28-2013, 10:47 AM
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2001 XJ Cherokee 
Join Date: Sep 2012
Location: Houston
Posts: 256
You need to put some grease on your transfer case output shaft for the clunk.

You probably have a defective oil pressure sender as well. Bring it back and get another one. If the problem persists, it may be something different. You could try a metal sending unit from older Cherokees like 92-93 those are known to last longer.

Take a look at my thread and see if you can answer my question.


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