Squeal Sound From Rear Wheels Area at Freeway Speeds When Not Accelerating

Well, I finally took the truck into the shop this week. They test
drove it and heard the same sound - Now, it happens (most times) at
about 45mph and above - never on accleration and only when either you
let up on the gas, or just coast. When the speed drops below about
40mph, the sound always goes away.

I thought before it was one side or another, but now I'm pretty sure
it's in the middle and possibly both sides as well. It's a high
pitched squeal sound - definitely metal on metal.

Anyway, the shop took off the wheels, checked the brake pads, wheel
bearings, diff fluid and visually inspected the thing. They couldn't
find anything wrong in there.

Based on the above info, does anyone have any ideas? I'm beginning to
think that either the differential or drive shaft or axles are to
blame?

Thanks!
Brad.

Bad carrier bearing?

--
Steve Williams

> wrote in message
oups.com...
> Well, I finally took the truck into the shop this week. They test
> drove it and heard the same sound - Now, it happens (most times) at
> about 45mph and above - never on accleration and only when either you
> let up on the gas, or just coast. When the speed drops below about
> 40mph, the sound always goes away.
>
> I thought before it was one side or another, but now I'm pretty sure
> it's in the middle and possibly both sides as well. It's a high
> pitched squeal sound - definitely metal on metal.
>
> Anyway, the shop took off the wheels, checked the brake pads, wheel
> bearings, diff fluid and visually inspected the thing. They couldn't
> find anything wrong in there.
>
> Based on the above info, does anyone have any ideas? I'm beginning to
> think that either the differential or drive shaft or axles are to
> blame?
>
> Thanks!
> Brad.
>




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I had a similar problem with my 98 T-100. All of the sudden one day I
started to get a high pitched rotational squeal when decelerating. I had
the trucks transmission and differential fluids serviced two weeks prior to
the start of the noise and at that time had scheduled a follow-up visit to
get the transfer case drive shaft seal replaced due to a small leak. Upon
returning to the dealership I ask them to check the noise. Prior to
changing the seal they drove the truck and were able to hear the noise but
they were unable to find the cause. The dealership proceeded to change the
oil seal which required the disconnection of the u-joint. After they
completed this work they suggested I drive the truck until the noise
worsened and the cause could be determined. However , after the seal repair
was completed the noise never returned. I believe the cause was either a
stuck needle bearing in the u-joint or the old seal contacting the drive
shaft. I most suspect the u-joint. Hope this helps.

dllj


"Steve W." > wrote in message ...
> Bad carrier bearing?
>
> --
> Steve Williams
>
> > wrote in message
> oups.com...
>> Well, I finally took the truck into the shop this week. They test
>> drove it and heard the same sound - Now, it happens (most times) at
>> about 45mph and above - never on accleration and only when either you
>> let up on the gas, or just coast. When the speed drops below about
>> 40mph, the sound always goes away.
>>
>> I thought before it was one side or another, but now I'm pretty sure
>> it's in the middle and possibly both sides as well. It's a high
>> pitched squeal sound - definitely metal on metal.
>>
>> Anyway, the shop took off the wheels, checked the brake pads, wheel
>> bearings, diff fluid and visually inspected the thing. They couldn't
>> find anything wrong in there.
>>
>> Based on the above info, does anyone have any ideas? I'm beginning to
>> think that either the differential or drive shaft or axles are to
>> blame?
>>
>> Thanks!
>> Brad.
>>
>
>
>
>
> -----------== Posted via Newsfeed.Com - Uncensored Usenet News
> ==----------
> http://www.newsfeed.com The #1 Newsgroup Service in the World!
> -----= Over 100,000 Newsgroups - Unlimited Fast Downloads - 19 Servers
> =-----

Thanks for all the tips and experiences. From searching on past
postings, this problem sure does prove to be a tough one to narrow
down.

My problem has now gone intermittent. I had a scheduled appointment
today at the differential specialist shop, and sure enough, not a
single sound out of the truck this time! They test drove it and the
put it on the rack and disconnected the drive shaft, checked the
u-joints and the pinion bearing for tightness. All were good. Ran it
at various speeds and decelerated. No sounds then or the rest of the
day.

He said he could sell me a bearing job for the differential, but it
would likely be a waste of money. An interesting thing he told me is
that if a rearend has problems, it will never be intermittent.

Anyone have any experiences with the intermittent side? Could
temperature or use cause it to start or stop making noise? What back
there could make this sound but only intermittently??

Thanks!