HIGH PITCH NOISE WHEN VEHICLE IS ACCERATING OR ...

  • Tiny
  • david.adlard
  • 2005 Jeep Grand Cherokee
  • 70,000 miles

High pitch noise when vehicle is accerating or sustaining speeds above 50 mph. Noise disappears when decelerating

Saturday, December 15th, 2012 AT 10:16 PM

8 Answers

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,305 posts

Does it sound like it is a belt?

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Saturday, December 15th, 2012 AT 10:17 PM
  • Tiny
  • fixitmr
  • Member

Check belt tension and inspect engine for intake vac leaks.

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Saturday, December 15th, 2012 AT 10:19 PM
  • Tiny
  • freemba
  • Expert
  • 1,115 posts

Could be a pinion bearing. Is this Jeep a 4X4?

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Saturday, December 15th, 2012 AT 10:22 PM
  • Tiny
  • fixitmr
  • Member

Gear noise could be the problem. How loud is it. Does it only do it in high/final gear? Is it manual trans? They tend to be noisy.

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Saturday, December 15th, 2012 AT 10:46 PM
  • Tiny
  • david.adlard
  • Member

It ix 4x4. I was guessing pinion bear. Just trying to confirm. Sorry I should have been more specific about noise. Noise is coming from rear of vehicle. Am not sure if it is drive line, differential, or rear bearings.

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Saturday, December 15th, 2012 AT 11:27 PM
  • Tiny
  • fixitmr
  • Member

Did it just start? Or has it got worse? I've seen people drive noisy gears for years. Your may be what's called a rear end howl, of course at that volume, the misaligment/wear is severe. Usually a model of vehicle is famous for certain noises and bad parts resulting.

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Sunday, December 16th, 2012 AT 3:38 AM
  • Tiny
  • david.adlard
  • Member

The noise started at 25,000 mile and has gotten prgressively worse. We took the vehilce to the deal back then but they said there was nothing wrong. Now the pitch is so high that it hurt the ears. I dont think that it would have been cover by warrantee because the defect can be tied to uneven tire ware.

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Wednesday, December 19th, 2012 AT 3:23 AM
  • Tiny
  • freemba
  • Expert
  • 1,115 posts

With park brake engaged and transmission in park (if automatic) or any gear if manual; try turning the drive shaft by hand to check for play in the pinion bearing. If there is a fair amount of play then suspect the bearing and race needs to be replaced.

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Wednesday, December 19th, 2012 AT 4:12 AM

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