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Old 07-24-2014, 11:24 AM
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Rear End Whine at High Speed

Hey everyone,

I have a 2005 Jeep Grand Cherokee Limited. This has been going on for a while now and I have been ok with it, but it seems to have gotten louder in recent months.

When I get up to highway speeds, around 65-75 mph, I begin hearing a constant "whine" from the back end. The whine goes away whenever I release the accelerator and it comes back when I get back on the gas.

Does anyone know what might be causing this or have any experience with a similar issue? I am well beyond warranty as I have ~150k miles on it. I have found similar posts before and it seems like it has to do with rear bearing, but I don't want to bring it into Jeep and have them inspect it for $150 if I can avoid it.

Thanks everyone and I hope that someone has good advice/experience with similar issues.

-Jas
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Old 07-24-2014, 11:34 AM
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Re: Rear End Whine at High Speed

Quote:
Originally Posted by JMills29 View Post
Hey everyone,

I have a 2005 Jeep Grand Cherokee Limited. This has been going on for a while now and I have been ok with it, but it seems to have gotten louder in recent months.

When I get up to highway speeds, around 65-75 mph, I begin hearing a constant "whine" from the back end. The whine goes away whenever I release the accelerator and it comes back when I get back on the gas.

Does anyone know what might be causing this or have any experience with a similar issue? I am well beyond warranty as I have ~150k miles on it. I have found similar posts before and it seems like it has to do with rear bearing, but I don't want to bring it into Jeep and have them inspect it for $150 if I can avoid it.

Thanks everyone and I hope that someone has good advice/experience with similar issues.

-Jas
All of the solid axle Jeeps have a rear end whine.
It tends to get louder with mileage...

If it is starting to bother you, have the rear axle rebuilt or do it yourself if you have the tools and materials, plus correct lubes.
As the gears wear, they don't quite mesh as tightly and that whines...
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Old 07-24-2014, 11:40 AM
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Re: Rear End Whine at High Speed

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Originally Posted by lstowell View Post
All of the solid axle Jeeps have a rear end whine.
It tends to get louder with mileage...

If it is starting to bother you, have the rear axle rebuilt or do it yourself if you have the tools and materials, plus correct lubes.
As the gears wear, they don't quite mesh as tightly and that whines...
Thanks for the heads up. Any idea what the cost of this would be? I have a good garage with a large tool set but I haven't taken on something this intense before so it's a bit intimidating.
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Old 07-24-2014, 11:49 AM
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Re: Rear End Whine at High Speed

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Originally Posted by JMills29 View Post
Thanks for the heads up. Any idea what the cost of this would be? I have a good garage with a large tool set but I haven't taken on something this intense before so it's a bit intimidating.
Kinda depends on what needs to be adjusted/replaced.
It could be as simple as just adjusting the pinion/ring gear mating, which requires marking them, measuring them, then looking at the pattern to make sure it is in exactly the correct pattern.

You would definitely want a factory service manual, a good aftermarket one, or a heavily bribed but unintoxicated buddy familiar with dana rebuilds even if you are mechanically inclined. They are somewhat of a pain.

Dana parts kits are in the $200 range, while you are in there, if you plan to keep it, might as well just rebuild/replace anything worn. A bit more dollars if the bearings out at the wheel ends are getting old.

If you have good local shops, you might want to google for axle rebuild shops, and take one who can identify your axle for you from memory.
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Old 07-24-2014, 03:03 PM
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Re: Rear End Whine at High Speed

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Originally Posted by lstowell View Post
Kinda depends on what needs to be adjusted/replaced.
It could be as simple as just adjusting the pinion/ring gear mating, which requires marking them, measuring them, then looking at the pattern to make sure it is in exactly the correct pattern.

You would definitely want a factory service manual, a good aftermarket one, or a heavily bribed but unintoxicated buddy familiar with dana rebuilds even if you are mechanically inclined. They are somewhat of a pain.

Dana parts kits are in the $200 range, while you are in there, if you plan to keep it, might as well just rebuild/replace anything worn. A bit more dollars if the bearings out at the wheel ends are getting old.

If you have good local shops, you might want to google for axle rebuild shops, and take one who can identify your axle for you from memory.
Thanks for the insight. I might have to stop into my local shop and see if they can possibly diagnose it without having to take my car completely apart. I appreciate it and hope that I can either deal with it or do this right. Thanks again!
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Old 07-29-2014, 05:39 AM
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Hi I had this also, it was the 2 bearings from the diff and also a play in the spider gear. More the gears than the bearing
Probably you can get if fixed easily.

Unfortunately no one in my area could rebuild or had the tools to do it I changed the whole rear axle I need my jeep every day.
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Old 07-29-2014, 05:09 PM
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Re: Rear End Whine at High Speed

Quote:
Originally Posted by lstowell View Post
All of the solid axle Jeeps have a rear end whine.
It tends to get louder with mileage...

If it is starting to bother you, have the rear axle rebuilt or do it yourself if you have the tools and materials, plus correct lubes.
As the gears wear, they don't quite mesh as tightly and that whines...
Mine does it very VERY mildly on decel from 65 to 50. I had an LS1 F-body that did it after a rear-end rebuild. Except it was similar speeds on accel. It never got worse, and I beat the crap out of it for another 50K miles. I took a poll once on the F-body forums about it, and 3/4 had "some sort of accel/decel whine", as I recall.

Unless it is progressively getting worse, like OP says his is, I would not mess with it. I messed with mine, and had a seriously solid mechanic with tons of experience doing F-body gear setups try to fix it, and when he chalked it off, he said the wear pattern was great, and lash checked out middle of spec. Nothing to be done, and nothing wrong.
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Old 08-04-2014, 12:49 PM
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Re: Rear End Whine at High Speed

Quote:
Originally Posted by JMills29 View Post
Hey everyone,

I have a 2005 Jeep Grand Cherokee Limited. This has been going on for a while now and I have been ok with it, but it seems to have gotten louder in recent months.

When I get up to highway speeds, around 65-75 mph, I begin hearing a constant "whine" from the back end. The whine goes away whenever I release the accelerator and it comes back when I get back on the gas.

Does anyone know what might be causing this or have any experience with a similar issue? I am well beyond warranty as I have ~150k miles on it. I have found similar posts before and it seems like it has to do with rear bearing, but I don't want to bring it into Jeep and have them inspect it for $150 if I can avoid it.

Thanks everyone and I hope that someone has good advice/experience with similar issues.

-Jas
99% sure it's your rear differential. Mine had the opposite problem. Whined on unload (deceleration) and went away with load (acceleration) at highway speeds. VERY common in Jeeps. I'm impressed you're made it 150k miles. Mine was replaced at 40k or so to the tune of $3k. Pricey, I know. I could have got it cheaper but I went with a brand new Jasper made diff. Problem solved.

You could get lucky and just need a bearing adjustment (or new bearing pack) and/or new fluids.

Skip the dealer and go to a transmission shop or other local mechanic. Good luck to you.
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Old 08-05-2014, 11:46 AM
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Re: Rear End Whine at High Speed

had the same thing on idle speeds and load with 180.000 km (115k miles)
getting so bad to the extend of getting worried for it to hold up.

went to my local garage who i regard as magicians

kit cost me about 300 for all bearings including pinion, and at the same time for new wheel bearings.
cost them a day or 3 because the axle nuts, and pinion bearings would not come off, but in the end they fixed it,

now happily driving without a single noise and cost of about 1500,- to fix (yes, garage is cheap)
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Old 08-05-2014, 11:58 AM
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Re: Rear End Whine at High Speed

A few necessities in life: A wife, a good dog and a trustworthy mechanic!

Glad it's fixed for you. And for a whole lot less than mine was!
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