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Old 06-16-2014, 03:51 PM
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Rear diff whining when off gas on highway

good afternoon all,

today I was driving on a highway when speed is over 55mph, every time I let go of gas, I can hear a whining sound from rear diff.,
but as soon as I step on gas paddle, the sound disappear.

the whining sound never happens on city drive no matter accelerate or decelerate

so which part(s) in the rear differential goes bad?
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Old 06-16-2014, 05:33 PM
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Re: Rear diff whining when off gas on highway

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Originally Posted by CarsonKT View Post
good afternoon all,

today I was driving on a highway when speed is over 55mph, every time I let go of gas, I can hear a whining sound from rear diff.,
but as soon as I step on gas paddle, the sound disappear.

the whining sound never happens on city drive no matter accelerate or decelerate

so which part(s) in the rear differential goes bad?
What year, and drive train options?

Did this just start suddenly, or has it always been there and just gradually increasing in loudness?

Could be the rear end, could be the transfer case.

Anyone work on it within the past several thousand miles, and possibly fill with the wrong lubes and additives?
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Old 06-16-2014, 07:15 PM
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Re: Rear diff whining when off gas on highway

lstowell thanks for your reply

it's a 06 WK v6 3.7, it's a base model so my guess is that it has 3.07:1 rear diff.

I actually only have this for about three weeks, when I test drive it I wasn't able to make it highway speed, my bad and now it bites me back, so I am not sure if any work is done.

I was planning to change the rear diff. oil, and two bottles of royal purple are already in my trunk, but haven't got time to do it.

my first suspicion was one day when I was on a dual carriageway, tried to over take a car and over the speed limit I heard the sound but I quickly slowed down the sound went away, so I didn't pay too much attention.

and today I drive on highway for about 40 mins, so I realize it makes whining noise

so I tested with gas on and off, it turns out it only whines when speed over 55 and gas off

the sound as far as my naked ears can tell, is not getting louder

as you've mentioned, this can be rear end or transfer case, are there any different symptoms to distinguish these two?
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Old 06-16-2014, 08:01 PM
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Re: Rear diff whining when off gas on highway

I don't think it's anything to worry about. Just about every vehicle I've ever owned has had some amount of whine from the rear differential under the circumstances you describe. I think the term is gear backlash? I think it's due to the way the gears are cut and that's considered normal.

LOL... my Honda Accord has even more than my GC's. Been that way since the day I bought it.

As long as you're following the maintenance recommendations in your owners manual in regards to changing the oil in the front and rear differentials and transfer case you should be just fine.
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Old 06-17-2014, 11:13 AM
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Re: Rear diff whining when off gas on highway

Improper bearing pre-load or bad pinion bearings usually result in a whine under deceleration.
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Old 06-17-2014, 12:36 PM
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Re: Rear diff whining when off gas on highway

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Originally Posted by dr.lee.baugh View Post
Improper bearing pre-load or bad pinion bearings usually result in a whine under deceleration.
+1 on this. My dad has his WK rear end rebuilt twice by the dealer and every time the whoom whoom sound of a failing rear end came back within 6 months. Not even the dealers can get the pre-load right. He traded in his WK for a WK2 after the second replacement failed.

That being said, if it's a higher whine, that's pretty normal and every Jeep I've ever owned has that.
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Old 06-17-2014, 03:06 PM
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Re: Rear diff whining when off gas on highway

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Originally Posted by CarsonKT View Post
lstowell thanks for your reply

it's a 06 WK v6 3.7, it's a base model so my guess is that it has 3.07:1 rear diff.

I actually only have this for about three weeks, when I test drive it I wasn't able to make it highway speed, my bad and now it bites me back, so I am not sure if any work is done.

I was planning to change the rear diff. oil, and two bottles of royal purple are already in my trunk, but haven't got time to do it.

my first suspicion was one day when I was on a dual carriageway, tried to over take a car and over the speed limit I heard the sound but I quickly slowed down the sound went away, so I didn't pay too much attention.

and today I drive on highway for about 40 mins, so I realize it makes whining noise

so I tested with gas on and off, it turns out it only whines when speed over 55 and gas off

the sound as far as my naked ears can tell, is not getting louder

as you've mentioned, this can be rear end or transfer case, are there any different symptoms to distinguish these two?
Since you are new to the vehicle, this could be a perfectly normal whine for the solid axle Jeep. You can spend a lot of money trying to set up the rear end, only to discover it still has a mild whine under decel.

Presume you bought this used, so I'd change every fluid--making sure to use the correct additives and friction modifier and don't wing it by using the wrong lube.



If you'd like to be sure, see if you can get a Jeep specialist to lay down in the back end and demonstrate.
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Old 06-20-2014, 10:38 PM
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Re: Rear diff whining when off gas on highway

Evening all and many thanks for all the replies.

I'll open up the rear diff. by the end of month and check all the gears inside and their teeth, and change the fluid in it.

I will report back when it's done.
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