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Old 05-24-2011, 10:21 AM
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Noise when accelerating at highway speeds

I'm having a pretty annoying problem when accelerating at around 55-65 on the highway I start to hear a high pitched whirring noise, only when hitting the gas. When I let go of the gas, it goes away. It only seems to make the noise around this speed range. Has anyone ever experienced this and fixed the problem?

Thanks in advance for any help!

Some info: 03 Sport, Stock suspension, 31" Tires, everything else is in pretty perfect condition.

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Old 05-24-2011, 10:27 AM   #2
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More info required. where is it coming from? The engine compartment? Under the Jeep? Rear? Left Side? right side?

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Old 05-24-2011, 10:35 AM
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More info required. where is it coming from? The engine compartment? Under the Jeep? Rear? Left Side? right side?
Under the Jeep, center, not the engine.
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Old 05-24-2011, 10:41 AM   #4
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I'd check the U joints for wear. what you described sounds exactly what to expect.

U joints are very simple and cheap to replace yourself, and finding them to be bad is pretty easy if you know what to look for. you can Google, search, or ask around here for help on identifying if they are good or bad.
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Old 05-24-2011, 10:48 AM
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I'd check the U joints for wear. what you described sounds exactly what to expect.

U joints are very simple and cheap to replace yourself, and finding them to be bad is pretty easy if you know what to look for. you can Google, search, or ask around here for help on identifying if they are good or bad.
Thanks for the advice. I've had to replace them on another vehicle of mine before. Would those really make a noise when only accelerating at a specific speed though?

More info: the Jeep only has 45,000 miles on it too.
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Old 05-24-2011, 11:04 AM   #6
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It could. I've replaced one on my Jeep so far, and the only way I noticed it was bad was it would start making a noise at around 25-30 MPH.

I'm not saying the U joints are the problem, just a good place to look first.
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Old 07-03-2013, 01:07 AM   #7
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Was it u joints. I have a sound that fits you description. Definitely only there when foot is on the gas. It instantly goes away if I lift off gas. Everybody keeps saying it is tire noise. They clearly aren't listening. Tire noise would be related to tire rotation not torque. I'd been told Rear diff issues, CV joints, fluid levels, you name it. It is clearly related to the torque being placed on something. My noise is noticeable to me at 45 mph. It gets louder and higher in pitch as the speed goes up. I changed ujoints recently on rear shaft when replacing pinion yoke and seal. I think this was going on before and after that repair.
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Old 07-03-2013, 05:07 AM   #8
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Either of you tried raising all four wheels off the ground and running thru the gears?
Staying in the same gear and laying hard on the accelerator increases the pitch of the noise?
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Old 07-08-2013, 10:48 AM   #9
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Mine is definitely related to acceleration. The pitch increases with acceleration an the second I lift off the throttle it stops or dies down. Some keep trying to say it is tire noise because I have mud terrain tires but this sound was there before I change tires. Plus tire noise would not be tied to the accelerator.
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Old 07-08-2013, 11:07 AM   #10
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My '98 does the same thing. I figure it's the pilot bearing or shaft bearing. I'll find out for sure when I replace the clutch.
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Old 07-08-2013, 01:15 PM   #11
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I have the same thing with my 2005 unlimited. Just bought it used with 74000 miles. I was told it was a torque converter problem.I had that replaced and also some transmission upgrades. for a $1600 bill. AND it did not correct anything!! Whats next?
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Old 07-09-2013, 06:17 PM   #12
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Bad u joint


Flash
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Old 07-09-2013, 06:25 PM   #13
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Bad u joint

Flash
Definitely not.
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Old 10-25-2018, 09:22 AM   #14
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I am having the same problem and can't figure it out!

It starts around 60mph and only when I am on the accelerator. As soon as I take my foot of the pedal the noise goes away. I replaced the vacuum lines and it still does it.

I have a 99 TJ 4.0 auto with 53k miles with 31" tires and 3.73 gears
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Old 10-25-2018, 06:37 PM   #15
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Is it intermittent or does it do it every time.
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Old 10-25-2018, 09:31 PM   #16
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Whine under load is USUALLY a pinion bearing.
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Old 10-27-2018, 02:58 PM   #17
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It does it all the time and only above 60mph, whether I am on cruise control, going uphill, downhill, etc. It does NOT do this at all below 60mph. No matter if I am at wot or not.

I uploaded a very short vid. You can hear when I let off the accelerator 1 second in and the sound briefly stops and then comes back when I press the accelerator.

https://youtu.be/VUrp12gZ2jM
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Old 10-29-2018, 09:15 AM   #18
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Same issue

I have a 2008 Grand Cherokee. I had the same sound at 45,000 mile I had to have the pinion bearing and race replaced. Now at 75,000 mile it is out again. Does anyone have a solution? This should last hundreds of thousands of miles. I am thinking it must be a factory defect in the housing or the oil distribution. It $1100 to fix it.
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Old 11-01-2018, 01:47 PM   #19
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Mine was the pinion bearing. Changed U-joints with no change in noise. New pinion bearings made the noise go away.
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Old 11-02-2018, 08:34 AM   #20
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Pinion bearing was the problem again. It lasted less then 25,000 miles. This time we put a new ring and pinion in. There has to be something wrong somewhere so this was a good stab at the problem.
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Old 11-09-2018, 10:09 AM   #21
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I am having a similar issue but have not yet found a remedy. My Jeep (2006 TJ w/ automatic transmission, 70k miles) makes a "woob woob woob" sound on the highway between 55-65 MPH ONLY when accelerating. The sound is not present if I am coasting, nor is the sound present at any other speed. I have been attempting to diagnose this issue for 3+ years but have had no luck...I'm hoping someone here may know the answer. The link below is to a video highlighting the sound (headphones recommended).

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Old 11-10-2018, 12:12 AM   #22
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Did you see my video? Does it sound like it?

Everyone says ring and pinion or the bearing. I will just regear and see if it fixes it.
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Old 11-10-2018, 07:40 AM   #23
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Did you see my video? Does it sound like it?

Everyone says ring and pinion or the bearing. I will just regear and see if it fixes it.
We are experiencing different sounds. Yours appears to be more high pitched which I believe could be the pinion bearing. I already replaced my pinion bearing with no luck.

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