have it properly flushed
if you are afraid of that then
do this.
pull pan
buy new gasket and filter (if it has filter, some cars dont)
then have mech. braze in a drain plug.
refill tranny !
now your Torque converter is full of dirty oil still.
some times 2/3rds the amount in pan.
run car 1 day.
drain oil . refill it. ( one of my cars has 2.3 qts in pan)
run car 1 day
drain oil , refill it.
notice oil now smells sweet (not burnt smell).
now every 3 oil engine change , change just the oil in the tranny oil pan.
if you do that , it may last forever ( well almost)
in my opinion (imho) i think the full flush is ok.
They only let the tranny pump oil up their external system and then it goes back to your tranny under the same pressure. It is as good and gentle as it can be.
The are not putting radical chemicals in to the tranny.
Id go for the factory flush or other major tranny shop.
for me I do my way because i am a cheap bastard.
there is only 2 ways.
not counting doing nothing.
pick one.
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