How to change the transmission fluid?

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Old 23 Feb 2005, 12:32 pm   #1 (permalink)
bauz
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Default How to change the transmission fluid?

I have a 1991 Camry 4cyl Auto, 97Km.
So far I always had the shop change the transmission fluid. When ever I
checked the level it was always a little above the max. The mechanic said
that this is the way it suppose to be. From reading the posts on this NG I
realized that the increased pressure can damage the transmission. I have
never seen the ATF level below the HOT region when the engine was cold,
although the hot level was close to the MAX mark (and not way above it)
when the transmission was hot.
I would be thankful if someone could give me some tips to avoid
overfilling. Since it is much easier to add than remove, is it safe to add
fluid up to the COLD region, drive the car and then check if more fluid
should be added?

Another important issue that I learned in this NG, is the need to change
the differential fluid. When I confronted my mechanic about it, he said
that there is no reason to replace it. When it was drained it was black
and thick. During the last 5 years I changed the ATF every 15K or less,
because it always appeared a little dark - is it possible that the dark
differential fluid got mixed with the trans fluid?
For 5 years, everytime I change my ATF, the mechanic says that my trans
about to die, although it never gave me any problem.


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Old 23 Feb 2005, 01:28 pm   #2 (permalink)
Jason James
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Default Re: How to change the transmission fluid?


"bauz" <b_avta@nospam.hotmail.com> wrote in message
news:dbeb559518f03ef6e428fde21e831817@localhost.ta lkaboutautos.com...

Cars are not designed to suddenly give you problems because you have a
slightly over-filled transmission. To get into trouble, requires a drastic
over-fill.



> I have a 1991 Camry 4cyl Auto, 97Km.
> So far I always had the shop change the transmission fluid. When ever I
> checked the level it was always a little above the max. The mechanic said
> that this is the way it suppose to be. From reading the posts on this NG I
> realized that the increased pressure can damage the transmission. I have
> never seen the ATF level below the HOT region when the engine was cold,
> although the hot level was close to the MAX mark (and not way above it)
> when the transmission was hot.
> I would be thankful if someone could give me some tips to avoid
> overfilling. Since it is much easier to add than remove, is it safe to add
> fluid up to the COLD region, drive the car and then check if more fluid
> should be added?


- with automatic transmissions, check them hot (after 15 miles or 25ks of
driving) as long as the oil level is within the min-max limits,
(preferabley as close to max as possible) it's fine
If its *slightly* overfull ( less than 1/8" or 3mm above the max mark)
there is no danger. Make sure the car is on a level surface when checking
the dipstick.


> Another important issue that I learned in this NG, is the need to change
> the differential fluid. When I confronted my mechanic about it, he said
> that there is no reason to replace it.


He's refering to older designed diffs on some rear-wheel drive cars (Fords,
GM stuff). The prevailing logic back then was that it was better not to open
the diff to contamination, plus they were mechanically removed from the
gearbox and thus were not susceptible to oil-contamination from the gearbox
(auto or manual),...not so today with transaxles in front wheel drive cars.
So the diff should be manitained as indicated in the driver's h/book or a
w/shop manual.


When it was drained it was black
> and thick.


It shouldn't be black,...it needed changing.


During the last 5 years I changed the ATF every 15K or less,

-that's a particularly short time interval.


> because it always appeared a little dark - is it possible that the dark
> differential fluid got mixed with the trans fluid?


Maybe.


> For 5 years, everytime I change my ATF, the mechanic says that my trans
> about to die, although it never gave me any problem.


Did he back up his claim by showing you ATF (from your car) which was
discoloured and any metal from the auto filter or pan? If not, he was being
less than honest.

Jason


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Old 23 Feb 2005, 01:49 pm   #3 (permalink)
m Ransley
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Default Re: How to change the transmission fluid?

The differential is to be changed with ATF fluid every 30000m . Have you
had your trans pan dropped and filter changed, it is also 30000m change.
Just fill the trans less and check it before you overfill it.

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Old 23 Feb 2005, 02:32 pm   #4 (permalink)
Philip
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Default Re: How to change the transmission fluid?

bauz wrote:
> I have a 1991 Camry 4cyl Auto, 97Km.
> So far I always had the shop change the transmission fluid. When ever
> I checked the level it was always a little above the max. The
> mechanic said that this is the way it suppose to be. From reading the
> posts on this NG I realized that the increased pressure can damage
> the transmission.

snip

IF you had stayed around a little longer (a day or so), you would also have
read a stern admonishment directed at the person who posted that rubbish
(over filling causes transmission pressure rise).

This forum is not moderated by a Toyota technician and only a couple of the
Users are employed Toyota technicians.

snip
> Another important issue that I learned in this NG, is the need to
> change the differential fluid. When I confronted my mechanic about
> it, he said that there is no reason to replace it. When it was
> drained it was black and thick. During the last 5 years I changed the
> ATF every 15K or less, because it always appeared a little dark - is
> it possible that the dark differential fluid got mixed with the trans
> fluid?
> For 5 years, everytime I change my ATF, the mechanic says that my
> trans about to die, although it never gave me any problem.


What kind fluid is your mechanic installing into the final drive box?
(differential).
--

- Philip



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Old 23 Feb 2005, 06:20 pm   #5 (permalink)
bauz
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Default Re: How to change the transmission fluid?

Thank you all for posting your comments.

>"What kind fluid is your mechanic installing into the final drive box?"

The fluid that the mechanic used for the transmission and the final drive
box was Dextron III.
>"Did he back up his claim by showing you ATF (from your car) which was

discoloured and any metal from the auto filter or pan?"
He didn't show me any metal, but I was present while he drained it, and it
was pretty brown.

>"IF you had stayed around a little longer (a day or so), you would also

have read a stern admonishment directed at the person who posted that
rubbish (over filling causes transmission pressure rise)."
I am relieved by knowing that a small over-filling should not cause any
damage. Several posters put strong emphasis on filling less rather than
overfilling. I am trying to prolong the life of the transmission,
therefore I replaced the fluid more often when it was dark, and got
concerned when I read about the (false) assumption about increased
pressure. Since the last differential fluid change (and probably also the
first) yield a very dark fluid, I would replace it again soon, and then go
back to normal intervals of 30K.

Thanks!
(BTW - I am new to posting on a NG and I hope I quoted other replies
properly. Is there any guide for proper posting?)

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Old 23 Feb 2005, 08:59 pm   #6 (permalink)
Philip
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Default Re: How to change the transmission fluid?

bauz wrote:
snip
> Thanks!
> (BTW - I am new to posting on a NG and I hope I quoted other replies
> properly. Is there any guide for proper posting?)


There may be an avalanche of replies to this question.

In your case, put a space (line) between your reply and the paragraph you
are responding to.

As for top vs. bottom vs. interspersed posting, once a top or bottom
posting precedent is established, stay with that format. Preserves
readability. Try to resist "interspersed" posting.
--

- Philip



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Old 07 Mar 2005, 12:16 am   #7 (permalink)
bauz
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Default Re: How to change the transmission fluid?

I found this good article:
http://www.autoshop101.com/forms/h17.pdf

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