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From: hls on 27 May 2010 09:17

"john" <johngdole(a)hotmail.com> wrote in message
news:87099afc-fafc-497b-b03b-d1b03a0b005e(a)v12g2000prb.googlegroups.com...
I'm sure it's a defect. However, if you read the following article
then you know Toyota is going to give you the run around in order to
save warranty costs.


******
No, you are not sure it is a defect, John. You are the prophet of all doom
on the groups.

I have had one tranny, GM, that started to whine after it was rebuilt. My
Dodge started to whine as it aged, and it was due to a vibrating valve,
annoying but not a defect.

Reading some patents yesterday, I found specific language about whining
due to ATF foaming (the patent for fluorinated polyethers for ATF praised
their ability to defoam these formulations).

So unless you are a tranny expert, which I sincerely doubt, you are not
sure.

The OP needs to have a competent transmission mechanic look this over.
Or just live with it, and if it fails repair it.

From: Dan on 31 May 2010 13:05
Some more inputs that may help diagnose the whine:
- whine changes in pitch at gear shift and car speed.
- it's louder after car was driven for a while
- under certain conditions (load/speed) it disappears.

It's very likely a defect either due to unusual wear or manufacturing
loose tolerances, since such noise should not be present.
However, I hope it won't cause premature failure, and it's merely an
annoyance.
I'm wondering if a transmission specialist in this forum may point to
the cause of it.
Is it possible it's the torque converter? If yes, does it live on
borrowed time?
From: Ray O on 31 May 2010 17:23

"Dan" <drnwnr(a)hotmail.com> wrote in message
news:f99a98aa-50aa-451c-9481-b217c64741a3(a)y12g2000vbr.googlegroups.com...
> Some more inputs that may help diagnose the whine:
> - whine changes in pitch at gear shift and car speed.
> - it's louder after car was driven for a while
> - under certain conditions (load/speed) it disappears.
>
> It's very likely a defect either due to unusual wear or manufacturing
> loose tolerances, since such noise should not be present.
> However, I hope it won't cause premature failure, and it's merely an
> annoyance.
> I'm wondering if a transmission specialist in this forum may point to
> the cause of it.
> Is it possible it's the torque converter? If yes, does it live on
> borrowed time?

What is the condition of the ATF?

Sounds that change in pitch and/or amplitude with changes in gear shift or
vehicle speed are not likely to be the transmission gear noise because if it
were, the sound would disappear as the planetary and sun gears are
stationary or rotating.

Torque converters generally do not make noise unless a bearing is bad and
since TC speed is determined by engine input speed, the sounds would be more
likely related to engine RPM than to the particular gear engaged.

A more likely cause of whine is the differential. Too much differential
pre-load can cause a whine, and too little can cause a clunk. Differential
whine often decreases or disappears when you back off the throttle and
coast. If that is the case with your car, the whine probably will not have
a negative effect on differential or transmission life. That said,
differential whine is usually repeatable under the same operating conditions
and doesn't come and go randomly.

A random noise could come from the valve body, and unless the ATF is
changing color rapidly, it is more of an annoyance than something that is
going to cause premature transmission failure.
--

Ray O
(correct punctuation to reply)


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