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Flushing the trans is only good if they are using all new fluid in the flusher - and have cleaned it out since the previous flush - which alot don't - and you end up with contamination from other transmissions.
There's alot to be said for a straight filter/fluid change in the traditional fashion.
Or, you can flush the fluid by opening the trans cooler line to the radiator - and pour fluid in while its pumping out - self-flush, no contamination, and alot cheaper.
A good local mechanic is usually a better alternative than an oil change place, where they're mostly sales operations, rather than professional-mechanic operations. There's a big difference.
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