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Old 04-02-2017, 06:50 PM
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Question Howling while accelerating

Hello everyone, I have a 2005 Jeep Grand Cherokee Limited 4.7L V8 4X4.
I heard a noise that apparently comes from the back. It's like a howl while accelerating over a small speed range. If I have my window down I can hardly hear that is howling. But if I have the window above, I hear it. Any Idea what can be. Thank You

PD: I rotate the tires and it stays the same.

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Old 04-03-2017, 09:19 AM
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Re: Howling while accelerating

When was the last time you changed the diff oil?
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Old 04-03-2017, 12:30 PM
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Re: Howling while accelerating

I boght it my Jeep couple weeks ago. So i have no idea so far.
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Old 04-03-2017, 12:43 PM
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Re: Howling while accelerating

Plan on replacing all fluids then, assume the po did no maintenance or very little. I bought mine used many years ago with about 55k mi on it. I think the po only changed the oil and put gas in it... After swapping all fluids it ran much smoother and more quiet. I start noticing the diff hum/whine after about 40k mi. And, it's about that time again. Wkjeeps.com has the maintenance info you are looking for.
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Old 04-04-2017, 07:01 PM
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Re: Howling while accelerating

UPDATED I already change the oil in both differentials. But, I am still hearing the howling. I guess my next step is going to be the rear wheel hub. Because I noticed that the noise does not change regardless of the road surface, so I am beginning to think it might be a bearing.

It could be that I have more then one issue like tires and maybe a Wheel Hub Bearing ??

Anyone have any thoughts??

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Old 04-04-2017, 07:33 PM
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Re: Howling while accelerating

Could be bearings... Does it get better/worse in the turns? That's how I'd diagnose those. Or Jack it up and give them a hard wiggle. Otherwise, how does the transfer case fluid look?
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Old 04-05-2017, 04:19 PM
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Re: Howling while accelerating

Quote:
Originally Posted by bensylrm View Post
Could be bearings... Does it get better/worse in the turns? That's how I'd diagnose those. Or Jack it up and give them a hard wiggle. Otherwise, how does the transfer case fluid look?
I have to verify the Transfer case oil. Do you think that can cause that resonant sound? I"ll check anyway. Thanks
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Old 04-05-2017, 05:50 PM
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Re: Howling while accelerating

I uploaded a video so you guys have a better idea of the noise.
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Old 04-05-2017, 08:59 PM
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Re: Howling while accelerating

Video helps a lot. That does sound like a warn out bearing, causing the side of the tire to hum. Could also be horribly out of alignment. The rear is fixed though... Any damage to the upper or lower rear control arms? It would be rare to see that happen. How do the brakes look? Caliper could also be frozen causing drag on one tire.
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Old 04-06-2017, 02:07 PM
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Re: Howling while accelerating

Could be a rear diff bearing. I have gone through 2 sets of rear diff bearings already at 130k and did all gear oil changed at 15k. Do both the pinion and carrier bearings and not just the bad one, as its mostly labor time. It's about $1,000 at most shops, more at dealer.
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Old 04-08-2017, 02:32 PM
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Re: Howling while accelerating

UPDATED : After making the diagnosis, they told me it was the Rear Carrier Bearing. How is that parts looks like? Can i use the vehicle while I found who can fix it? Thank you guys.
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Old 04-08-2017, 02:54 PM
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Re: Howling while accelerating

Quote:
Originally Posted by dmsfun View Post
Could be a rear diff bearing. I have gone through 2 sets of rear diff bearings already at 130k and did all gear oil changed at 15k. Do both the pinion and carrier bearings and not just the bad one, as its mostly labor time. It's about $1,000 at most shops, more at dealer.
You were right that is my problem. Is it better to change all the differential or just repair that part? Thank You
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