I have been reading up on the A604 a bit, especially
since I'm gonna have to dive into a rebuild (or
something!) this spring (assuming the car still goes
forword through then!).
This site:
http://www.atraonline.com/html/gears/sep99/28-a604.html
brings up a very interesting bit about the overheating
due to the cooler- dark fluid (which can also be
charracteristic of old fluid- due to being used and
breaking down....) indecating overheating from the
cooler getting clogged.
Is the cooler they pictured the same as ours?
It seems that the simple solution would be to grab a
large atf to air radiiator/cooler and an inline filter
and just stop using the oem filter. Would give more
atf capasity, plus would cool better.
I know my A604's fluid is quite dark, despite changes,
etc. Most of the times I've had bad problems with
shifting (excluding reverse after my fun snow day- but
that's a different problem from my forward gear
problems) has been after I've been driving long enough
for the fluid to be hot, or on hot days, or on really
really really cold days (i.e. -20 degrees). Perhaps
then I cooked everything a bit too much? Certainly
makes sense. Older fluid plus lots of heat and a weak
tranny = destruction!
BTW- anyone know what the actual A604 gear ratios are
from year to year?
I'm thinking an A604 with a good gear ratio, extra big
cooler and external filter, better soleniod pack and
valve body (from different year), flashable TCM and
extended pan w/drain plug would give me more power and
stability, no?
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