[V8] Transmission filter & Gasket R&R

cobram at juno.com cobram at juno.com
Wed Sep 27 13:47:30 EDT 2006

Doesn't seem to be in the archives, here's a repost from a few years ago:

#1, replace fluid with a good synthetic, MobilOne Synthetic ATF (about $5
a quart) is one of the best.

If you've never done it before, it might be a good idea to change/check
the filter.   To get the pan off you'll have to remove the crossover pipe
for the exhaust, have some bungee cords handy to hang the crossover so
that you don't have to disconnect the O2 sensor.  Don't mix up the
exhaust doughnuts, they're two different sizes.  By draining the pan
you'll only get about 3 quarts of fluid out, some people like to
fill/drain several times until the mixture thins out to a high percentage
of new fluid.

First time I changed mine the filter was spotless so I don't change the
filter with the fluid every time (IF the old fluid is clean.)  I change
the fluid by removing the two transmission cooler lines that go into the
radiator, it takes a 10mm socket (I replaced the factory allens),
extension and universal to get these off, a 13mm for the long bolt that
holds the lines at the compressor.
You might want to have some O rings handy if you want to change them,
I've reused them several times with no leaks, just clean hole in radiator
well and grease them a little.  Also a Hex driver for the trans. pan.

With the lines out of the radiator and hanging down into a bucket and the
dipstick open, have a 2nd person start the car.  The fluid will pump
right out into the bucket in less than 30 seconds.  As soon as the stream
of old fluid stops (usually get a little sputter) turn the car off.  You
will want to make sure you shut it right down as soon as the flow stops.
Then remove the plug from the trans. pan (drains about 2 qt.) and let the
lines hang low until the fluid stops siphoning out (about a half hour.)
Put everything back, fill with about 7 quarts, start it up and cycle
through the gears,  you can check the dipstick after the trannie is up to
operating temperature (if the engine oil temp is up to normal, it's a
safe bet the trannie fluid is too.)

It will usually take 8 quarts to fill using this procedure.

Although I've never used a commercial flushing machine on the V8Q, based
on the fluid pressure I've observed, IF you have the correct connections
it looks like a flushing/filling machine would work well.  The flush
machines I've seen use the trans. pressure to force out the old fluid
while pumping in the new, usually with a view glass to gauge the old
fluids clarity.  There are many cars (Toyota is one) that do not work
well at all with flush machines, but the V8Q might be a good candidate.

Hit any key to continue, or any other key to quit.

justin.bowers at comcast.net writes:
> Hi all,
> I would like to change out the transmission filter and gasket on my 
> V8, and while I recall reading an excellent write up on it in the 
> past, I can't seem to locate it now...do any of you have the write 
> up for the R&R of the transmission filter?
> Justin
> 90 V8q

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