Mitsubishi Montero & Montero Sport This sport utility vehicle offers more size than the other Mitsubishi SUVs, but manages to keep a sporty look and comfortable feel, unlike many larger SUVs.

Differential noise. How hard to fix?

  #1  
Old 06-06-2018, 10:47 PM
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Default Differential noise. How hard to fix?

Iím hearing noise from the rear differential and from what Iíve researched it looks like it may be the pinion bearing. A hum/whine that starts around 40mph. Goes away if i let off gas but immediately returns if i press the accelerator again. 1995 montero sr. Is this a common issue? Have any of you done this repair? Could if be something else?
 
  #2  
Old 06-07-2018, 03:12 AM
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All diffs will make a whining noise when they're worn. Wear is usually caused by bad/old oil and/or excessive abuse. Oil change might help quite some. I can recommend to use Royal Purple Max gear (75W-90 on yours?), top notch oil fortified with antifriction additives. I have used this in several diffs/gears with whining noise, and it helps alot. Not 100% always, but significant at least.
 
  #3  
Old 06-07-2018, 09:09 AM
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I just changed out the oil and it did seem to help a bit. It makes me a little nervous because my grandpa had a diff lock up on the highway once. I donít think mine is close to failing at this point. At least I hope not.
 
  #4  
Old 06-07-2018, 10:34 AM
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If you got a slight improvement with an ordinary oil, you will have more improvement with Royal Purple, for sure.
An alternative can be high quality additives or prefferable some metal treatments. Qmi has some PTFE metal treatments that makes a tiny layer of teflone on metal surfaces.
 
  #5  
Old 06-07-2018, 11:24 AM
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Good to know, thanks for the tip. Iíll look into getting a better oil in there. Iím going to lift the rearend up and see if i can focus exactly where the noise is coming from.
 
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