I am in the process of changing atf and filter on my C6 trans. I dropped
the pan. Also opened the torque converter access plate and the screw was
right there, so I drained it. The shop manual only says a partial change
can be done by dropping pan- I don't know why they don't mention draining
converter too. Am I about to find out?? I am going to scrape the gasket
and get some fluid now. One problem is the dipstick wll show way overfull
if I go and pour 3 gallons of atf down the tube, I think.
The only correct way to service the C6 is to drain both the
converter and the pan. You shoulkd also change the filter
which will include a gasket. You will not be able to dump
12 qts of fluid into it at one shot. You will need to fill
it to "full" with the engine off and the start the engine
for about 10 sec or so. Again fill it to full. and start
the engine for a few secs. This is filling the converter.
You may have to repeat until it does not drop significantly.
At this point shift it thru the ranges and allow it to warm
at which time you will check it again. At no time allow it
to be overfull with the engine running. Drive it around for
a few minutes and check it warm in park or nietral. Add as
needed to bring to Full.
I followed your directions and everything worked out great. I put in a
quart too much though but just pulled off a rubber hose to the cooler and
ran it a few seconds to pump out excess.
I have 2 books, one the Ford shop manual, and all they say is pull the pan.
So when I drained the torque converter, I thought I might have to turn my
motorhome upside down to fill it back up! I did change the filter and
gasket. When I dropped the pan I found a plastic "mushroom" laying in it.
I went to the Ford dealer to figure it out and he said it was just a dust
plug for the dipstick hole they pop out when they build it- lucky me.
That plug almost always indicates that was the first time
the trans has been serviced. It is used to transport and
install the trans at the factory. The dipstick tube is just
shoved in which results in the plug being inside the trans.
The C6 is a tough trans but, should be serviced every 30k
miles or so in auto use. About 15-20 k miles in truck use.
I recall many years ago getting chewed out by a customer for not
part. He swore I was leaving parts out of his car when I serviced the trans. He
hard time grasping why it didn't need to go back somewhere in his transmission.
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