Drain, or remove all tranny fluid

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Old 22 Nov 2005, 11:49 pm   #1 (permalink)
Father Guido
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Default Drain, or remove all tranny fluid

Hi,

I've got a '99 Auto XLE V6 with 150K km on it (90K miles). I bought
the car two years ago, and have no idea when/if the tranny fluid was
ever changed before. It's still slightly pink to look at. Should I
just ask the dealer to drain it and refill when I do my next couple of
oil changes, or should I get them to take it apart to clean everything
out? The tranny is working beautifully right now and I don't want any
tranny troubles in the near future from dealer errors that show up
down the line.

PS This dealer only does a srain on a coolant replacement, not a flush
if that means anything at all.

Thanks,

Norm
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Old 23 Nov 2005, 05:58 am   #2 (permalink)
m Ransley
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Default Re: Drain, or remove all tranny fluid

Drop the pan put in a new filter, Dealers overcharge for this.

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Old 23 Nov 2005, 11:32 pm   #3 (permalink)
johngdole@hotmail.com
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Default Re: Drain, or remove all tranny fluid

Drop the pan and replace the strainer/filter. Clean the metal shavings
from the magnets and the bottom of the pan. Fram has a kit with cork
rubber gasket for about $17. Don't use a gasket with recycled tire
rubber. Make sure you change out the strainer/filter.

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Old 25 Nov 2005, 10:39 am   #4 (permalink)
Daniel
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Default Re: Drain, or remove all tranny fluid

I suppose it wouldn't hurt to remove the pan and clean or replace the
strainer and clean the magnets as others have suggested, but my view is
that you only need to drain and fill the transmission fluid when you do
the engine oil.
You say it is still slightly pink. What I do, is compare it to new
transmission fluid and if the color is different, change it. You're
only removing a portion with drain and fill, so changing it regularly
helps.
In my opinion, there shouldn't be any need to replace or service the
filter screen. It is just a wire mesh screen - not filter media like an
air or oil filter.
On mine there are three permanent magnets on the inside bottom of the
pan to trap metal fragments or filings. In my humble opinion, that
ought to be sufficient to hold them out of circulation for the life of
the car. If the gasket were leaking and you remove the pan I would
definitely clean them, but would not remove the pan just to do that.
The inside of the transmission must be kept scrupulously clean. Even a
tiny bit of thread from a rag snagging on a rough casting can interfere
with the proper operation of the valve body, so in my opinion, it is
best not to open the case unless necessary.
If you do remove and clean the pan and magnets, the correct way is to
spray with solvent and then air dry or use compressed air - not a rag.
The prior owner had someone replace or service something so I had a
leaking gasket and had the pan removed interior surface and magnets
cleaned along with the filter strainer. Then the gasket leaked again,
so the next time I purchased a new gasket from the dealer. Then I
discovered the reason for the leak - two of the transmission pan bolts
were stripped. They're only supposed to be tightened to a measurement
in "inch" pounds of torque, so seems a prior mechanic over tightened
them and didn't say anything about it. Thank God I was able to thread
longer bolts through the case in those locations which worked fine.
Perhaps the tendency to easily ruin those threads may be another reason
not to remove the pan unnecessarily.
Transmission fluid is highly detergent, and if you change it regularly,
I would think you should be fine.
My suggestions if you're doing your own work are these:
1) by letting it drain over night, you'll get almost an extra quart to
come out
2) by using an inexpensive telescoping magnet, you can retrieve the
drain plug from a plastic drain pan without having to reach into hot
transmission fluid
3) by measuring the old fluid into old oil bottles with a measurement
strip on the side, you can come extremely close to filling in the exact
right quantity of new transmission fluid
4) be certain you drive at least ten (10) miles to bring the
transmission fully up to normal operating temperature before making the
final level check.

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Old 25 Nov 2005, 10:57 am   #5 (permalink)
m Ransley
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Default Re: Drain, or remove all tranny fluid

Dan, trans filters I have seen can`t be cleaned as its an enclosed unit,
it is a filter, fluid goes through it, inside is the dirt. Any reduction
in flow from dirt in the filter,can case problems

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Old 29 Nov 2005, 04:48 pm   #6 (permalink)
mechosu@hotmail.com
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Default Re: Drain, or remove all tranny fluid

My toyota dealer said they don't replace the strainer (filter), but
only clean it. I found this out when I inquired about the cost of a
new filter. The new toyota part is about $45, so I guess this is how
they save a few dollars on a transmission fluid change. I would
recommend using only toyota T4 transmission fluid if this is what your
vehicle calls for. I personally wipe the pan down with paper towels
and then clean any lint off by flushing with straight acetone and
letting it dry (it only takes a few seconds). You'd never believe how
sensitive a transmission is. I know of countless cases where a
transmission rebuild only bought a few more thousand miles (I
personally only got about 10K, before problems returned). And I see
both sides being correct. Some people fuss with the transmission and
create problems, while others never touch the thing and get 200K or
more. It is easily debated one way or the other. I don't think these
things are built in clean rooms, so I guess if your careful, you
shouldn't have any troubles.

On Fri, 25 Nov 2005 10:57:57 -0600, ransley@webtv.net (m Ransley)
wrote:

>Dan, trans filters I have seen can`t be cleaned as its an enclosed unit,
>it is a filter, fluid goes through it, inside is the dirt. Any reduction
>in flow from dirt in the filter,can case problems

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