transmission rumble

I have a 1995 4 runner with auto transmission. When sitting idle or
decelerating there is an audible rumble under the transmission. I took
it to the shop and they said that drive shaft was bent and the
compression plate holding it to the transmission was loose. They
replaced the shaft and tightened the compression plate. Seemed like it
was gone but in a couple hours I started to hear it again. The car
drives fine and I have had very little problems with it. It still goes
into 4 wheel just fine. Any ideas about the sound and if this is a sign
of inevitable transmission failure?
thanks.

On Wed, 29 Mar 2006 14:37:06 -0800, xenon66 wrote:
[color=blue]
> I have a 1995 4 runner with auto transmission. When sitting idle or
> decelerating there is an audible rumble under the transmission. I took
> it to the shop and they said that drive shaft was bent and the
> compression plate holding it to the transmission was loose. They
> replaced the shaft and tightened the compression plate. Seemed like it
> was gone but in a couple hours I started to hear it again. The car
> drives fine and I have had very little problems with it. It still goes
> into 4 wheel just fine. Any ideas about the sound and if this is a sign
> of inevitable transmission failure?
> thanks.[/color]

I would guess the output bearing in the transmission.

--
In the grand scheme fo things...
What difference does it make?

<xenon66@gmail.com> wrote in message
news:1143671826.826215.93730@z34g2000cwc.googlegroups.com...[color=blue]
>I have a 1995 4 runner with auto transmission. When sitting idle or
> decelerating there is an audible rumble under the transmission. I took
> it to the shop and they said that drive shaft was bent and the
> compression plate holding it to the transmission was loose. They
> replaced the shaft and tightened the compression plate. Seemed like it
> was gone but in a couple hours I started to hear it again. The car
> drives fine and I have had very little problems with it. It still goes
> into 4 wheel just fine. Any ideas about the sound and if this is a sign
> of inevitable transmission failure?
> thanks.
>[/color]

Actually, the drive shaft (A.K.A. propeller shaft) is attached to the
transmission and differential by companion flanges. I can never remember
which way is the correct way without looking at the book, but it is possible
for the universal joints to be 90 degrees out of phase. The easiest correct
way to remove and replace a drive shaft and maintain the correct phase is to
mark the companion flanges so that they go back the correct way. Also, if
the drive shaft is out of balance, Toyota dealers sell weighted bolts for
the companion flanges. If the drive shaft was bent, then the engine,
transmission, and transfer case mounts and alignment should be checked.

As hachiroku mentioned, it is possible that the transmission or transfer
case output shaft bearing can be bad but I'd check stuff related to the
original driveshaft damage first.
--

Ray O
(correct punctuation to reply)

Thanks for your quick responses, and advice. Any idea on the price of
replacing that bearing? Since the drive shaft is brand new I think that
variable has now been eliminated. I'll probably have to move on the
more expensive repairs or just let it go. Neither options sounds all
that great.

<xenon66@gmail.com> wrote in message
news:1143735856.645500.63670@g10g2000cwb.googlegroups.com...[color=blue]
> Thanks for your quick responses, and advice. Any idea on the price of
> replacing that bearing? Since the drive shaft is brand new I think that
> variable has now been eliminated. I'll probably have to move on the
> more expensive repairs or just let it go. Neither options sounds all
> that great.
>[/color]

Depends on if you have a dealer that charges by the hour or "Flat Rate" The
Flat Rate time includes totally removing the transmission from the car,
removing the bearing, replacing and reinstalling the transmission.

The hourly rate includes removing the driveshaft, removing the bearing,
reinstalling the bearing and replacing the driveshaft.

Now, considering the fact the driveshaft was bent out of shape. it *IS*
possible the bearing was damaged.
I would check what Ray said first; this will be cheaper and may solve the
problem.

The other thing is, I was basing my 'guess' on the W58 5-speed trans; you
have an automatic...